Al-Muazzam Isa vs Michael of Chernigov

Al-Muazzam Isa, as Ayyubid ruler of Damascus, participated in the defense against the Fifth Crusade. The Crusaders besieged Damietta in the Nile Delta. Al-Muazzam Isa's forces were unable to prevent the city's fall in 1219, leading to a temporary Crusader occupation.

Al-Muazzam Isa, alongside his brother Sultan Al-Kamil of Egypt, negotiated the end of the Fifth Crusade. The treaty restored Damietta to the Ayyubids in exchange for a truce and the Crusaders' withdrawal from Egypt. This secured Ayyubid control over the region.

Al-Muazzam Isa engaged in a power struggle with his brother Sultan Al-Kamil of Egypt. He allied with the Khwarezmian prince Jalal al-Din against Al-Kamil. This internal Ayyubid conflict weakened the dynasty and allowed Crusader states to regain territory.

Al-Muazzam Isa died in Damascus, likely from natural causes. His death ended his rivalry with Al-Kamil and allowed the Egyptian sultan to consolidate Ayyubid power. His son An-Nasir Dawud succeeded him but was later deposed by Al-Kamil.

Michael of Chernigov ruled as Prince of Chernigov when the Mongol Empire under Batu Khan invaded Rus'. Chernigov was besieged and captured by the Mongols in 1239. Michael fled to Hungary and then to Poland, seeking military aid against the invaders. His inability to defend his principality marked the collapse of Chernigov's independence.

Michael of Chernigov was summoned to the court of Batu Khan in Sarai. He refused to perform pagan rituals, including walking through fire and bowing to idols, as required by Mongol custom. For his refusal, he was executed by the Mongols along with his boyar Fedor. His death was later recognized as a martyrdom for the Orthodox faith.