Blaj (Romanian pronunciation: [blaʒ]; archaically spelled as Blaș; Hungarian: Balázsfalva; German: Blasendorf; Transylvanian Saxon dialect: Blußendref) is a city in Alba County, Transylvania, Romania. It has a population of 20,630 inhabitants.The landmark of the city is the fact that it was the principal religious and cultural center of the Romanian Greek-Catholic Church in Transylvania.