Nin was historically important as a centre of a medieval Christian Bishopric.
Up to the abolition and Latinization imposed by King Tomislav in the first half of the 10th century, Nin was the centre of the autonomous Croatian branch of the Church. Nin was also the seat of the Princes of Dalmatia. The Bishop Gregory of Nin (Grgur Ninski) was an important figure in the 10th century ecclesiastical politics of Dalmatia.
