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 Another merger follows in 1945 with the "Catholic" club "Parchevich". After this wave of mergers, like many others in the country, the club is renamed to an abbreviation of the biggest clubs merged - the new name is "S.P.-45", meaning "Sportclub Parchevich - 1945". However, because of the "Western" phrasing ("sport" and "club" are non-Slavic words) the team is renamed again before the start of the season - the name of the club becomes ""Slavia" Plovdiv". In 1947 a new wave of consolidations of the sport organisations in the country sees Slavia Plovdiv merge with the team of the cooperative