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1235, and is first mentioned in circa 1260/62, when he was assigned to capture the city of Mesembria on the Black Sea coast from the deposed Bulgarian tsar Mitso Asen (r. 1256–1257).
Located on top of the fortified Tsarevets hill in the former capital of the Second Bulgarian Empire, the cathedral was the seat of the Bulgarian patriarch from its construction in the 11th–12th century to its destruction in 1393.
On the other hand, other historians consider the towers very similar to ones found in Tsepina, Shumen, Perperikon, Vidin, consequently attributing it Bulgarians, who are also known to have controlled the region at certain times during the probable period of construction.