The Alemanni (also Alamanni; Suebi "Swabians") were a confederation of Germanic tribes on the Upper Rhine River. First mentioned by Cassius Dio in the context of the campaign of Caracalla of 213, the Alemanni captured the Agri Decumates in 260, and later expanded into present-day Alsace, and northern Switzerland, leading to the establishment of the Old High German language in those regions, by the eighth century named Alamannia.
In 496, the Alemanni were conquered by Frankish leader Clovis and incorporated into his dominions. Mentioned as still pagan allies of the Christian Franks, the Alemanni were gradually Christianized during the seventh century. The Lex Alamannorum is a record of their customary law during this period. Until the eighth century, Frankish suzerainty over Alemannia was mostly nominal. After an uprising by Theudebald, Duke of Alamannia, though, Carloman executed the Alamannic nobility and installed Frankish dukes. During the later and weaker years of the Carolingian Empire, the Alemannic counts became almost independent, and a struggle for supremacy took place between them and the Bishopric of Constance. The chief family in Alamannia was that of the counts of Raetia Curiensis, who were sometimes called margraves, and one of whom, Burchard II, established the Duchy of Swabia, which was recognized by Henry the Fowler in 919 and became a stem duchy of the Holy Roman Empire.
The area settled by the Alemanni corresponds roughly to the area where Alemannic German dialects remain spoken, including German Swabia and Baden, French Alsace, German-speaking Switzerland, Liechtenstein and Austrian Vorarlberg.
The French language name of Germany, Allemagne, is derived from their name, from Old French aleman(t), from French loaned into a number of other languages. Likewise, the Spanish name for Germany is Alemania, and Welsh is Yr Almaen.
According to Gaius Asinius Quadratus (quoted in the mid-sixth century by Byzantine historian Agathias), the name Alamanni (Ἀλαμανοι) means "all men". It indicates that they were a conglomeration drawn from various Germanic tribes. The Romans and the Greeks called them as such mentioned. This derivation was accepted by Edward Gibbon, in his Decline and Fall of the Roman Empire  and by the anonymous contributor of notes assembled from the papers of Nicolas Fréret, published in 1753. This etymology has remained the standard derivation of the name. An alternative suggestion proposes derivation from alah
Walafrid Strabo in the 9th century remarked, in discussing the people of Switzerland and the surrounding regions, that only foreigners called them the Alemanni, but that they gave themselves the name of Suebi. The Suebi are given the alternative name of Ziuwari (as Cyuuari) in an Old High German gloss, interpreted by Jacob Grimm as Martem colentes ("worshippers of Mars").
Cassius Dio portrays the Alemanni as victims of this treacherous emperor. They had asked for his help, according to Dio, but instead he colonized their country, changed their place names, and executed their warriors under a pretext of coming to their aid. When he became ill, the Alemanni claimed to have put a hex on him. Caracalla, it was claimed, tried to counter this influence by invoking his ancestral spirits.
In retribution, Caracalla then led the Legio II Traiana Fortis against the Alemanni, who lost and were pacified for a time. The legion was as a result honored with the name Historia Augusta, Life of Antoninus Caracalla, relates (10.5) that Caracalla then assumed the nameAlemannicus,"at which Helvius Pertinax jested that he should really be called 
Through much of his short reign, Caracalla was known for unpredictable and arbitrary operations launched by surprise after a pretext of peace negotiations.
This mutually antagonistic relationship is perhaps the reason why the Roman writers persisted in calling the Alemanni barbari," meaning "savages." The archaeology, however, shows that they were largely Romanized, lived in Roman-style houses and used Roman artifacts, the Alemannic women having adopted the Roman fashion of the tunicaeven earlier than the men.
Most of the Alemanni were probably at the time, in fact, resident in or close to the borders of Germania Superior. Although Dio is the earliest writer to mention them, Ammianus Marcellinus used the name to refer to Germans on the Limes Germanicus in the time of Trajan's governorship of the province shortly after it was formed, around 98-99 AD. At that time, the entire frontier was being fortified for the first time. Trees from the earliest fortifications found in Germania Inferior are dated by dendrochronology to 99-100 AD.
Ammianus relates (xvii.1.11  ) that much later the Emperor Julian undertook a punitive expedition against the Alemanni, who by then were in Alsace, and crossed the Main (Latin Menus), entering the forest, where the trails were blocked by felled trees. As winter was upon them, they reoccupied a "fortification which was founded on the soil of the Alemanni that Trajan wished to be called with his own name".
In this context, the use of Alemanni is possibly an anachronism, but it reveals that Ammianus believed they were the same people, which is consistent with the location of the Alemanni of Caracalla's campaigns.
Germania by Tacitus (AD 90) in Chapter 42  states that the Hermunduri were a tribe certainly located in the region that later became Thuringia. Tacitus states that they traded with Rhaetia, which in Ptolemy is located across the Danube from Germania Superior, suggesting that the Alemanni originally in part derived from the Hermunduri.
However, no Hermunduri appear in Ptolemy, though after the time of Ptolemy, the Hermunduri joined with the Marcomanni in the wars of 166–180 against the empire. Tacitus says that the source of the Elbe is among the Hermunduri, somewhat to the east of the upper Main. He places them also between the Naristi (Varisti), whose location was at the very edge of the Black Forest, and the Marcomanni and Quadi. Moreover, the Hermunduri were broken in the Marcomannic Wars and made a separate peace with Rome. The Alemanni thus were probably not primarily the Hermunduri, although some elements of them may have been present.
Before the mention of Alemanni in the time of Caracalla, one would search in vain for Alemanni in the moderately detailed geography of southern Germany in Claudius Ptolemy, written in Greek in the mid-second century; at that time, the people who later used that name likely were known by other designations.
Nevertheless, some conclusions can be drawn from Ptolemy.
Historic Swabia was eventually replaced by today's Baden-Württemberg, but it had been the most significant territory of mediaeval Alamannia, comprising all Germania Superior and territory east to Bavaria. It did not include the upper Main, but that is where Caracalla campaigned. Moreover, the territory of Germania Superior was not originally included among the Alemanni's possessions.
However, if one looks for the peoples in the region from the upper Main in the north, south to the Danube and east to the Czech Republic where the Quadi and Marcomanni were located, Ptolemy does not give any tribes. The Tubanti are just south of the Chatti and at the other end of what was then the Black Forest, the Varisti, whose location is known. One possible reason for this distribution is that the population preferred not to live in the forest except in troubled times. The region between the forest and the Danube, though, included about a dozen settlements, or "cantons".
Ptolemy's view of Germans in the region indicates that the tribal structure had lost its grip in the Black Forest region and was replaced by a canton structure.
The term Suebi has a double meaning in the sources.
The solution to the puzzle as well as explaining the historical circumstances leading to the choice of the Agri Decumates as a defensive point and the concentration of Germans there are probably to be found in the German attack on the Gallic fortified town of Vesontio in 58 BC. The upper Rhine and Danube appear to form a funnel pointing straight at Vesontio.
Julius Caesar in Gallic Wars tells us (1.51  ) that Ariovistus had gathered an army from a wide region of Germany, but especially the Harudes, Marcomanni, Triboci, Vangiones, Nemetes and Sedusii. The Suebi were being invited to join. They lived in 100 cantons (4.1  ) from which 1000 young men per year were chosen for military service, a citizen-army by our standards and by comparison with the Roman professional army.
Ariovistus had become involved in an invasion of Gaul, which the German wished to settle. Intending to take the strategic town of Vesontio, he concentrated his forces on the Rhine near Lake Constance, and when the Suebi arrived, he crossed. The Gauls had called to Rome for military aid. Caesar occupied the town first and defeated the Germans before its walls, slaughtering most of the German army as it tried to flee across the river (1.36ff). He did not pursue the retreating remnants, leaving what was left of the German army and their dependents intact on the other side of the Rhine.
The Gauls were ambivalent in their policies toward the Romans.
The Alemanni were continually engaged in conflicts with the Roman Empire in the 3rd and 4th centuries. They launched a major invasion of Gaul and northern Italy in 268, when the Romans were forced to denude much of their German frontier of troops in response to a massive invasion of the Goths from the east. Their raids throughout the three parts of Gaul were traumatic: Gregory of Tours (died ca 594) mentions their destructive force at the time of Valerian and Gallienus (253–260), when the Alemanni assembled under their "king", whom he calls Chrocus, who "by the advice, it is said, of his wicked mother, and overran the whole of the Gauls, and destroyed from their foundations all the temples which had been built in ancient times. And coming to Clermont he set on fire, overthrew and destroyed that shrine which they call Vasso Galatae in the Gallic tongue," martyring many Christians (Historia Francorum Book I.32–34  ). Thus 6th-century Gallo-Romans of Gregory's class, surrounded by the ruins of Roman temples and public buildings, attributed the destruction they saw to the plundering raids of the Alemanni.
In the early summer of 268, the Emperor Gallienus halted their advance into Italy, but then had to deal with the Goths. When the Gothic campaign ended in Roman victory at the Battle of Naissus in September, Gallienus' successor Claudius Gothicus turned north to deal with the Alemanni, who were swarming over all Italy north of the Po River.
After efforts to secure a peaceful withdrawal failed, Claudius forced the Alemanni to battle at the Battle of Lake Benacus in November. The Alemanni were routed, forced back into Germany, and did not threaten Roman territory for many years afterwards.
Their most famous battle against Rome took place in Argentoratum (Strasbourg), in 357, where they were defeated by Julian, later Emperor of Rome, and their king Chnodomarius was taken prisoner to Rome.
On January 2, 366, the Alemanni yet again crossed the frozen Rhine in large numbers, to invade the Gallic provinces, this time being defeated by Valentinian (see Battle of Solicinium). In the great mixed invasion of 406, the Alemanni appear to have crossed the Rhine river a final time, conquering and then settling what is today Alsace and a large part of the Swiss Plateau. The crossing is described in Wallace Breem's historical novel Eagle in the Snow. The Chronicle of Fredegar gives the account. At Alba Augusta (Alba-la-Romaine) the devastation was so complete, that the Christian bishop retired to Viviers, but in Gregory's account at Mende in Lozère, also deep in the heart of Gaul, bishop Privatus was forced to sacrifice to idols in the very cave where he was later venerated. It is thought this detail may be a generic literary ploy to epitomize the horrors of barbarian violence.
- 259, Battle of Mediolanum—Emperor Gallienus defeats the Alemanni to rescue Rome
- 268, Battle of Lake Benacus—Romans under Emperor Claudius II defeat the Alemanni.
- 271 Battle of Placentia—Emperor Aurelian is defeated by the Alemanni forces invading Italy Battle of Fano—Aurelian defeats the Alemanni, who begin to retreat from Italy Battle of Pavia—Aurelian destroys the retreating Alemanni army.
- 298 Battle of Lingones—Caesar Constantius Chlorus defeats the Alemanni Battle of Vindonissa—Constantius defeats the Alemanni.
- 356, Battle of Reims—Caesar Julian is defeated by the Alemanni
- 357, Battle of Strasbourg—Julian expels the Alemanni from the Rhineland
- 368, Battle of Solicinium—Romans under Emperor Valentinian I defeat an Alemanni incursion.
- 378, Battle of Argentovaria—Western Emperor Gratianus is victorious over the Alemanni.
- 451, Battle of the Catalaunian Fields-Roman General Aetius and his army of Romans and barbarian allies defeat Attila's army of Huns and other Germanic allies, including the Alemanni.
- 457, Battle of Campi Cannini, Alemanni invade Italy and are defeated near Lake Maggiore by Majorian
- 554, Battle of the Volturnus-Armenian-Roman General Narses defeats a combined force of Franks and Alemanni in southern Italy.
The kingdom of Alamannia between Strasbourg and Augsburg lasted until 496, when the Alemanni were conquered by Clovis I at the Battle of Tolbiac. The war of Clovis with the Alemanni forms the setting for the conversion of Clovis, briefly treated by Gregory of Tours. (Book II.31  ) Subsequently, the Alemanni formed part of the Frankish dominions and were governed by a Frankish duke.
In 746, Carloman ended an uprising by summarily executing all Alemannic nobility at the blood court at Cannstatt, and for the following century, Alemannia was ruled by Frankish dukes. Following the treaty of Verdun of 843, Alemannia became a province of the eastern kingdom of Louis the German, the precursor of the Holy Roman Empire. The duchy persisted until 1268.
The German spoken today over the range of the former Alemanni is termed Alemannic German, and is recognised among the subgroups of the High German languages. Alemannic runic inscriptions such as those on the Pforzen buckle are among the earliest testimonies of Old High German. The High German consonant shift is thought to have originated around the 5th century either in Alemannia or among the Lombards; before that the dialect spoken by Alemannic tribes was little different from that of other West Germanic peoples.
Alemannia lost its distinct jurisdictional identity when Charles Martel absorbed it into the Frankish empire, early in the 8th century. Today, Alemannic is a linguistic term, referring to Alemannic German, encompassing the dialects of the southern two thirds of Baden-Württemberg (German State), in western Bavaria (German State), in Vorarlberg (Austrian State), Swiss German in Switzerland and the Alsatian language of the Alsace (France).
The Alemanni established a series of territorially defined pagi (cantons) on the east bank of the Rhine. The exact number and extent of these pagi is unclear and probably changed over time.
Pagi, usually pairs of pagi combined, formed kingdoms (regna) which, it is generally believed, were permanent and hereditary. Ammianus describes Alemanni rulers with various terms: reges excelsiores ante alios ("paramount kings"), reges proximi ("neighbouring kings"), reguli ("petty kings") and regales ("princes"). This may be a formal hierarchy, or they may be vague, overlapping terms, or a combination of both. In 357, there appear to have been two paramount kings (Chnodomar and Westralp) who probably acted as presidents of the confederation and seven other kings (reges). Their territories were small and mostly strung along the Rhine (although a few were in the hinterland). It is possible that the reguli were the rulers of the two pagi in each kingdom. Underneath the royal class were the nobles (called optimates by the Romans) and warriors (called armati by the Romans). The warriors consisted of professional warbands and levies of free men. Each nobleman could raise an average of c. 50 warriors.
The Christianization of the Alemanni took place during Merovingian times (6th to 8th centuries). We know that in the 6th century, the Alemanni were predominantly pagan, and in the 8th century, they were predominantly Christian. The intervening 7th century was a period of genuine syncretism during which Christian symbolism and doctrine gradually grew in influence.
In the mid-6th century, the Byzantine historian Agathias records, in the context of the wars of the Goths and Franks against Byzantium, that the Alemanni fighting among the troops of Frankish king Theudebald were like the Franks in all respects except religion, since
He also spoke of the particular ruthlessness of the Alemanni in destroying Christian sanctuaries and plundering churches while the genuine Franks were respectful towards those sanctuaries.
Apostles of the Alemanni were Columbanus and his disciple Saint Gall. Jonas of Bobbio records that Columbanus was active in Bregenz, where he disrupted a beer sacrifice to Wodan. Despite these activities, for some time, the Alemanni seem to have continued their pagan cult activities, with only superficial or syncretistic Christian elements. In particular, there is no change in burial practice, and tumulus warrior graves continued to be erected throughout Merovingian times. Syncretism of traditional Germanic animal-style with Christian symbolism is also present in artwork, but Christian symbolism becomes more and more prevalent during the 7th century. Unlike the later Christianization of the Saxons and of the Slavs, the Alemanni seem to have adopted Christianity gradually, and voluntarily, spread in emulation of the Merovingian elite.
From c. the 520s to the 620s, there was a surge of Alemannic Elder Futhark inscriptions. About 70 specimens have survived, roughly half of them on fibulae, others on belt buckles (see Pforzen buckle, Bülach fibula) and other jewelry and weapon parts. Use of runes subsides with the advance of Christianity. The Nordendorf fibula (early 7th century) clearly records pagan theonyms, logaþorewodanwigiþonar read as "Wodan and Donar are magicians/sorcerers", but this may be interpreted as either a pagan invocation of the powers of these deities, or a Christian protective charm against them. A runic inscription on a fibula found at Bad Ems reflects Christian pious sentiment (and is also explicitly marked with a Christian cross), reading god fura dih deofile ᛭ ("God for/before you, Theophilus!", or alternatively "God before you, Devil!"). Dated to between AD 660 and 690, it marks the end of the native Alemannic tradition of runic literacy. Bad Ems is in Rhineland-Palatinate, on the northwestern boundary of Alemannic settlement, where Frankish influence would have been strongest.
The establishment of the bishopric of Konstanz cannot be dated exactly and was possibly undertaken by Columbanus himself (before 612). In any case, it existed by 635, when Gunzo appointed John of Grab bishop. Constance was a missionary bishopric in newly converted lands, and did not look back on late Roman church history unlike the Raetian bishopric of Chur (established 451) and Basel (an episcopal seat from 740, and which continued the line of Bishops of Augusta Raurica, see Bishop of Basel). The establishment of the church as an institution recognized by worldly rulers is also visible in legal history. In the early 7th century Pactus Alamannorum hardly ever mentions the special privileges of the church, while Lantfrid's Lex Alamannorum