John of Arsuf was the regent of Jerusalem under which memberof the Hohenstaufen dynasty?
John of Arsuf:  He served as regent of Jerusalem on two occasions: 1253–1254 for Conrad II and 1256–1258 for Conrad III. Conrad IV of Germany: 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.
Conrad