The paper discusses the structure and carved decoration of the restored marble sanctuary screen from the island of Koločep near Dubrovnik. Based on the early medieval history of present-day southern Dalmatia and the fragmentary inscription commemorating a queen as the donor of the screen, it may be concluded that she was one of the Serbian Doclean (Duklja) queens from the second half of the eleventh century. The inscription is the only evidence that the kings of Dioclea ruled over the Elaphite islands. The carved decoration is typical of the Middle Byzantine period (9th-12th century), with some regional traits. The only exceptions are the figures of putti. They can be associated with Romanesque architectural sculpture in southern Italy created in the late eleventh century, after the Norman conquest of this region. The author puts forward the hypothesis that the donor was Queen Jaquinta, wife of King Bodin (1081-1101), who was a Norman woman from Bari.