
Holy Roman Emperor who negotiated the return of Jerusalem.
Frederick II was excommunicated by Pope Gregory IX for failing to fulfill his crusade vow. This excommunication led to a long conflict between Frederick and the Papacy, weakening the Holy Roman Empire.
Frederick II negotiated the Treaty of Jaffa with Sultan al-Kamil of Egypt. The treaty returned Jerusalem, Bethlehem, and Nazareth to Christian control without a battle, marking a diplomatic victory for Frederick.
Frederick II crowned himself King of Jerusalem in the Church of the Holy Sepulchre in March 1229. This act was controversial because he was excommunicated by the Pope at the time.
Frederick II issued the Constitutions of Melfi, a comprehensive legal code for the Kingdom of Sicily. The code centralized royal authority, reformed the judiciary, and promoted economic development.
Frederick II defeated the Lombard League at the Battle of Cortenuova. The victory strengthened his control over northern Italy but did not end the League's resistance.