Alba Iulia (Romanian pronunciation: [ˌalba ˈjuli.a] (listen); German: Karlsburg or Carlsburg, formerly Weißenburg; Hungarian: Gyulafehérvár; Latin: Apulum) is a city that serves as the seat of Alba County in the west-central part of Romania. Located on the Mureș River in the historical region of Transylvania, it has a population of 63,536 (as of 2011).During the ancient times, the site was the location of the Roman camp Apulum. Since the High Middle Ages, the city has been the seat of Transylvania's Roman Catholic diocese. Between 1542 and 1690 it was the capital of the principality of Transylvania. At one point it also was a center of the Eastern Orthodox Metropolitan of Transylvania with suffragan to Vad diocese. On 1 December 1918, the Union of Transylvania with Romania was declared in Alba Iulia, and the Romania's King Ferdinand I and Queen Marie were crowned in the Alba Iulia Orthodox Cathedral, in 1922.Alba Iulia is historically important for Romanians, Hungarians, and...