ostrogorsky made the kingdom of yugoslavia his permanent home and taught at belgrade for 40 years until his retirement in 1973, leaving the chair for byzantinology to božidar ferjančić. he was made a corresponding member of the serbian academy of sciences and arts in 1946 and a regular member two years later. an institute of byzantinology was created within the academy in 1948 with himself as director, a post he held until his death. he was chief editor of the institute's house organ, the zbornik radova vizantološkog instituta, through its 16th volume which appeared in 1975. he also supervised the monograph series of the institute of which the choice items were his own study "pronija" (1951) and the multivolume collection of byzantine sources for the history of the nations of yugoslavia.