Conrad IV, King of the Romans

Conrad IV
King of Germany
(formally King of the Romans)
King of Italy
ReignMay 1237 – 21 May 1254
PredecessorHenry (VII)
SuccessorWilliam
King of Sicily
Reign13 December 1250 – 21 May 1254
PredecessorFrederick I
SuccessorConrad II
King of Jerusalem
Reign4 May 1228 – 21 May 1254
PredecessorIsabella II and Frederick I
SuccessorConrad III
RegentFrederick (until 1243), Alice (1243–1246), Henry (1246–1253) and Plaisance (from 1253)
Duke of Swabia
Reign12 February 1235 – 21 May 1254
PredecessorHenry
SuccessorConrad IV
Born25 April 1228
Andria, Kingdom of Sicily
Died21 May 1254(1254-05-21) (aged 26)
Lavello, Kingdom of Sicily
Burial
SpouseElisabeth of Bavaria
IssueConradin
HouseHohenstaufen
FatherFrederick II, Holy Roman Emperor
MotherIsabella II of Jerusalem

Conrad (25 April 1228 – 21 May 1254), a member of the Hohenstaufen dynasty, was the only son of Emperor Frederick II from his second marriage with Queen Isabella II of Jerusalem. He inherited the title of King of Jerusalem (as Conrad II) upon the death of his mother in childbed. Appointed Duke of Swabia in 1235, his father had him elected King of Germany (King of the Romans) and crowned King of Italy (as Conrad IV) in 1237. After the emperor was deposed and died in 1250, he ruled as King of Sicily (Conrad I) until his death.