Duchy of Philippopolis

The Duchy of Philippopolis was a short-lived duchy of the Latin Empire founded after the collapse and partition of the Byzantine Empire in 1204. It included the city of Plovdiv and the surrounding region. It was liberated for a short time by Emperor Kaloyan of Bulgaria in 1207 but was lost by his successor Boril following his defeat at the battle of Plovdiv. The territory of the duchy finally joined the Bulgarian Empire during the first years of the reign of Ivan Asen II (1218-1241).

From 1204 to 1205 it was ruled by Renier of Trit.