Frederick III, Holy Roman Emperor
In 1439, king Albert II of Germany died and next year his son Ladislaus the Posthumous succeeded him in Bohemia and Austria. In 1444, he was proclaimed King in Hungary and Croatia after the interim King Vladislaus I Jagiellon died at the Battle of Varna. Germany went to Albert's second cousin, who became Frederick III, Holy Roman Emperor, due to its elective monarchy.