The Master's thesis provides a catalog overview of preserved, in sources and / or in situ, sacral architecture in the town of Nin from 4th to 11th century. The introductory chapters deal with the historical-geographical context with the purpose of better understanding of sacral architecture and transformation of the urban historical landscape of that area from 4th to 11th century. They include the geostrategic position of the town of Nin in a shallow sandy lagoon on the northern edge of Ravni kotari; the history of the area from the prehistory and, through ancient Aenona to the medieval city; history of authority in the area of Nin in the period from 4th to 11th century; transformations of urbanism from prehistory to 11th century; and the development of Christianity in Nin and the founding of the Diocese of Nin. The main part of the Master's thesis, the catalog review, includes a description and analysis of the architecture and sculpture (with dating) of nine, preserved and presumed, churches on the island of Nin in the period from 4th to 11th century, but also a review of previous research of each of the churches. In conclusion, the Master's thesis brings the presumed reconstruction of the transformation of the urban historical landscape and a review of the difficulties that a modern scientist and researcher may encounter.