Ivan Asen II vs Tervel of Bulgaria

Ivan Asen II expanded Bulgarian territory through campaigns against the Latin Empire and the Kingdom of Thessalonica. He captured Adrianople and extended Bulgarian influence into the Peloponnese.

Ivan Asen II defeated the Despotate of Epirus at Klokotnitsa. The victory restored Bulgarian control over Thrace, Macedonia, and Albania, making Bulgaria the dominant power in the Balkans.

Ivan Asen II built the Church of the Holy Forty Martyrs in Veliko Tarnovo to commemorate his victory at Klokotnitsa. The church became a major cultural and religious monument.

Ivan Asen II secured recognition of the Bulgarian Patriarchate from the Ecumenical Patriarch of Constantinople. This restored the autocephalous status of the Bulgarian Church, enhancing national prestige.

Tervel provided military support to the exiled Byzantine Emperor Justinian II, helping him regain the throne. In return, Tervel was awarded the title of Caesar and received territorial concessions.

Tervel signed a treaty with the Byzantine Emperor Theodosius III that established borders, regulated trade, and included a clause for mutual defense. This treaty strengthened Bulgarian-Byzantine relations.

Tervel, Khan of Bulgaria, sent a Bulgarian army to aid the Byzantine Empire during the Second Arab Siege of Constantinople. The Bulgarian forces attacked the Arab rear, contributing to the lifting of the siege and saving the city.