They are dualists, like the Bogomils, ascribing the body to a fall from a state when the soul was on the same plane as God.
Polygamy is almost unknown, possibly because many of the "Turks" are descended from the austere Bogomils, who were, in most cases, converted to Islam, but more probably because the "Turks" are as a rule too poor to provide for more than one wife on the scale required by Islamic law.
Early in the 12th century a new religion, that of the Bogomils (q.v.), was introduced, and denounced as heretical.
Herzegovina, where Vukcic offered a desperate resistance, held out until 1483; but apart from the heroic defence of Jajce, the efforts of the Bosnians were feeble and inglorious, many of the Bogomils joining the enemy.
Some upheld a rival claimant to the throne in Tvrtkovic, a legitimate son of Tvrtko, and all took sides in the incessant feud between Bogomils and Roman Catholics.