Peter IV of Bulgaria

Theodor-Peter Asen, who ruled as Tsar Peter IV (died 1197), was the eldest of the Asen brothers who restored Bulgaria. In 1185 the Byzantine emperor Isaac II Angelos refused his and Asen's request for land in the Balkan Mountains, and the emperor's uncle John Doukas ordered Asen struck. The brothers roused the Bulgarians and Vlachs to revolt, and Peter was crowned tsar before year's end.

Defeated in 1186, he fled to the Cumans and returned with Cuman troops. He took Preslav in the brothers' partition around 1192; after Asen's murder in 1196 he made Kaloyan co-ruler, but was himself killed in 1197.