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Celje(tsĕ`lyĕ), city (1991 pop. 40,710), in Slovenia. Metallurgy, chemicals, and food processing are the chief industries. Founded (1st cent. A.D.) by the Roman Emperor Claudius, it was the seat (1341–1456) of the powerful Slovenian counts of Celje (or Cilli). In the city are a 13th-century monastery and a 16th-century palace.
a city in Yugoslavia, in the Socialist Republic of Slovenia. Population, 34,000 (1972). In addition to a zinc works, Celje has metalworking, chemical, wood-products, textile, leather and footwear, and food-processing industries. In the suburb of Store there is a metallurgical plant. Brown coal is mined near Celje.