Alba Iulia (; or
Carlsburg, formerly
Weißenburg, , ,
Ottoman Turkish:
Erdel Belgradi or
Belgrad-i Erdel) is a city located on the
Mures River in
Alba County,
Transylvania,
Romania, with a population of 63,536 . Since the
High Middle Ages, the city has been the seat of Transylvania's
Roman Catholic diocese. Between 1541 and 1690 it was the capital of the
Eastern Hungarian Kingdom and the latter
Principality of Transylvania. Alba Iulia is historically important for Hungarians, Romanians and
Transylvanian Saxons.