Demetrius of Thessaloniki
The Vlachs living in Boeotia, Greece were described as false Christians by Benjamin of Tudela in 1165. However, the Vlach brothers Peter and Asen built a church in order to gather Bulgarian and Vlach prophets to announce that St Demetrius of Thessaloniki had abandoned their enemies, while arranging their rebellion against the Byzantine Empire. The Bulgarians and the Vlachs revolted and created the Second Bulgarian Empire. The head of the Bulgarian Orthodox Church was elevated to the rank of "Primate of the Bulgarians and the Vlachs" in 1204.