Isaac II Angelos
Isaac II Angelos (1156–1204) was Byzantine emperor from 1185 to 1195 and again in 1203–1204. In 1185 he took refuge in Hagia Sophia after a killing, sparking the revolt that toppled Andronikos I.
Taxes provoked a Bulgarian and Vlach revolt that founded the Second Bulgarian Empire; his reign also saw Cyprus lost and defeats at Tryavna in 1190 and Arcadiopolis in 1194. In 1195 his brother Alexios III blinded and imprisoned him. Restored by the Fourth Crusade in 1203 with his son Alexios IV, he died in 1204, weeks before the city was sacked.