The first mention of the city of Požega is found in the Gesta Hungarorum, by an anonymous notary of Béla III (1172–1196) where he mentions the conquest of three forts in Slavonia - as the area between rivers Danube and Sutla was then called: Zagreb, Vlco (Vukovar) and Posega. The fortress of Požega, an elongated hexagonal fortification located on a hill in the present-day city center, was probably built during the 11th century, although the first documents that clearly mention Požega county date from 1210, while the city of Požega was documented for the first time in a charter of Andrew II on January 11, 1227.