Frederick II (26 December 1194 – 13 December 1250; Latin: Fridericus, Federicus, Italian: Federico, German: Frîderich, Friedrich) was King of Sicily from 1198, King of Germany from 1212, King of Italy and Holy Roman Emperor from 1220 and King of Jerusalem from 1225. He was the son of emperor Henry VI of the Hohenstaufen dynasty and of Constance, heiress to the Norman kings of Sicily.

Frederick III (21 September 1415 – 19 August 1493) was Holy Roman Emperor from 1452 until his death. He was the first emperor of the House of Habsburg, and the fourth member of the House of Habsburg to be elected King of Germany after Rudolf I of Germany, Albert I in the 13th century and his predecessor Albert II of Germany. He was the penultimate emperor to be crowned by the Pope, and the last to be crowned in Rome.