The paper provides an overview of the architecture of the island of Pag from the 4th to the 11th century and an overview of the social and historical events during this period. In the first part of the paper, the geographical features and the relief of the island are presented as the first determinants of shaping the historical landscape. Special emphasis is placed on the territorial-administrative division that sets Pag apart as a unique island in the Adriatic, divided into two counties. The paper is based on field research and a review of all relevant literature, as well as the most significant archaeological excavations of sites. The changes in the landscape of Pag are, not only geographically conditioned, but also determined by the historical circumstances and events on the island, in the region and in the wider European area. The theoretical framework of these changes is described through the most important political and social events from antiquity to the late Middle Ages, focusing on the period from the 4th to the 11th century. An overview of the process of transformation of the historical landscape of the island is given, from the time of the construction of the first Roman villas on the eastern coast of the Adriatic, through the fortification architecture of late antiquity, to the early Christian and early medieval sacral architecture. Finally, an account of all known sites from the north to the south of the island is presented, with an overview of the most important findings from literature and research, as well as mention of some sites that have not yet been confirmed or preserved.The number of ancient and medieval architecture on the island of Pag has decreased significantly over the centuries, either due to natural forces or human influence, so only rare examples can testify to the changes the island and its population have experienced throughout history. The few remains therefore call for further research, valorization and much-needed protection.