Dimitar Atanassov Rumenchev (or Roumentchev) was probably the best Bulgarian referee of the 20th century. He took charge of 160 A League matches in his own country and of matches in the Olympic Tournament, the European Championships and the 1966 World Cup. See his palmares.
Rumenchev died in 1993.
Rumenchev was assistant referee in the World Cup in Chile 1962.