Among the sculptural remains found during the excavation of the Church of St. Peter in Zavala near Popovo Polje (in the vicinity of Trebinje), the altar screen deserves special attention. The preserved fragments are decorated with three-part ribbon ornaments, and the fragment with depictions of birds is particularly interesting. Most fragments have different geometrical ornaments and images of birds that symbolise the Eucharist. Most scholars date the altar screen to the 9th or 10th century. It is kept in the Museum of Hercegovina in Trebinje.