Novinite: Archaeologists have discovered a 9th century church which may be the site of the conversion of Bulgaria's first Christian ruler, Boris I. Bulgarian archaeologists have found the remains of a medieval church near Debelt, which may have been the place where Prince Boris I converted to Christianity in the first half of the 9th century. Debelt was a port city, connected by several rivers to the Black Sea and was part of the Byzantine Empire. Seals of Prince Boris I were discovered during the excavation.