Prof. Dr. Fran, Zwitter was born on the 24th October 1905 in Bela Cerkev in Lower Carniola, died in Ljubljana on 14th April 1988. After his studies in Ljubljana and advanced scientific studies in Vienna and Paris he took a Grammar school professor job in Ljubljana. From 1938 to his retirement in 1975 he was Professor at the University in Ljubljana. During World VVar II he was confined, then joined the partisans and in 1944 became the director of the Scientific Institute at the presidency of SNOS (Slovene National — Liberation Gouncil). Zwitter researched into various problems: developement of population (Population on Slovene Territory from Middle of XVIII. Century to Nowadays), the question of borders, medieval towns, nationality question in the Habsburg monarchy. Fran Zwitter also introduced methods of the French school of history. He was from the first issue of the Historical Review member of its editorial office and from 1950 to his death he was commiteeman at Slovenska matica. He collaborated in preparing the History of Nations of Yugoslavia.