PFC Botev Plovdiv is known as "Bultras". Botev's eternal rival is the neighbouring city club of Lokomotiv Plovdiv, and both form the local Plovdiv derby. The two teams are the most supported ones in the second largest city in Bulgaria – Plovdiv – and the matches between them are well known to the Bulgarian football community, and also considered to be one of the fiercest rivalries in the world. Botev is the country's oldest continuously existing team, whereas Lokomotiv grew popular fanbase in the 70s. Traditionally, Lokomotiv's team drew support from the lower working class of society, whereas Botev's fanbase consisted mainly of
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