II. Isaac Angelos, Emperor of the Byzantine Empire (1185-1195), was born in 1156, the son of the military leader Andronikos Doukas Angelos and Euphrosyne Kastamonitissa. In 1185, after the overthrow of Emperor Andronikos I Komnenos, Isaac Angelos was crowned Emperor of Byzantium at the age of 29. During his reign he strengthened his position with family marriages. In 1185, he married a woman named Herina, from whom he soon divorced. In 1186, he married Margaret of Hungary, III. The daughter of the Hungarian king Béla. His military successes, he recaptured Thessalonica from the Normans in 1185. He defeated the Serbs in 1190. His military failures, in 1186 the Bulgarians and Vlachs revolted, founding the second Bulgarian Empire. In 1189, during the Third Crusade, the army of the German-Roman Emperor Frederick Barbarossa threatened Constantinople. Financial difficulties and corruption plagued the empire. Isaac's wasteful courtship and military failures made him unpopular. In 1195, his younger brother III. During the usurpation of Alexios Angelos, he was blinded and imprisoned. In 1203, he was freed during the Fourth Crusade and his son IV was crowned co-emperor. Alexios. In 1204, Alexios V. Mourtzouphlos carried out a coup d'état, and was killed by IV. He imprisoned Alexios and Isaac Angelos, where he soon died. His reign was characterized by military successes and failures, internal difficulties and dynastic struggles. He was one of the actors in the events leading to the disaster of the Fourth Crusade. He could not prevent the decline of the Byzantine Empire.

II. Emperor Isaac Angelos ruled the Byzantine Empire between 1185 and 1195. During his reign, some important changes were made in the field of coinage. During the reign of Emperor Izsák Angelos, in the Byzantine Empire, gold coins called "nomisma" began to be issued. This gold coin replaced the previous gold currency, the "solidus". During its reign, the value of the silver coin was determined similarly to gold. As a result, new silver coins were issued that represented a certain fraction of the value of gold. These silver coins later spread throughout the empire. II. Coins minted by Emperor Isaac Angelos often contain characteristic markings and inscriptions, which carried the ruler's name and imperial title. These changes show that during all the reigns of Emperor Isaac Angelos, significant reforms were made in the coinage system of the Byzantine Empire, aimed at the change of power and the ruler it was a demonstration of his power.