Plovdiv city was possibly at times a vassal of Bulgaria or Venice. Ivan Asen II conquered the duchy finally in 1230 but the city had possibly been conquered earlier. Afterwards, Plovdiv was conquered by Byzantium. According to some information, by 1300 Plovdiv was a possession of Theodore Svetoslav of Bulgaria. It was conquered from Byzantium by George Terter II of Bulgaria in 1322. Andronikos III Palaiologos unsuccessfully besieged the city, but a treaty restored Byzantine rule once again in 1323. In 1344 the city and eight other cities were surrendered to Bulgaria by the regency for John V Palaiologos as the
PFC Lokomotiv Plovdiv club of the railway workers in Plovdiv". The first years of the team are difficult as its performance does not bring about such glory as some of the other teams of the city like Sportclub or Botev Plovdiv. The club is accepted as a member of the national sport federation a whole three years after its creation. Nevertheless, in the early 1940s the team betters their performance and in 1944 wins the Championship of Plovdiv. In an economical aspect the railway club contributes heavily to the development of sports in the region of Plovdiv, making large inputs for the improvement