The Slavonic sources are unanimous on the point that Bogomil's teaching was Manichaean. A "Synodikon" from the year 1210 adds the names of his pupils or "apostles", Mihail, Todur, Dobri, Stefan, Vasilie and Peter. Zealous missionaries carried their doctrines far and wide. In 1004, scarcely 25 years after the introduction of Christianity into Kievan Rus, we hear of a priest Adrian teaching the same doctrines as the Bogomils. He was imprisoned by Leontius, Bishop of Kiev. In 1125, the Church in the south of Rus had to combat another heresiarch named Dmitri. The Church in Bulgaria also tried to extirpate Bogomilism. Several thousand went in the army of Alexios I Komnenos against the Norman, Robert Guiscard; but, deserting the emperor, many of them (1085) were thrown into prison. Efforts were again put forth for their conversion; and for the converts the new city of Alexiopolis was built, opposite Philippopolis. When the Crusaders took Constantinople (1204), they found some Paulicians, whom the historian Geoffrey of Villehardouin calls Popelicans.