[1] Bogomil is a Theophoric name consisting of Bog (God) and mil (dear) and means "[one who is] dear to god".
He was declared a heresiarch by both the Catholic and Orthodox churches.
[2] According to Cosmas the Priest, Bogomil first began to preach his beliefs in Bulgaria during the reign of Peter I of Bulgaria (927 to 969),[3] which indicates that Cosmas must have been writing later than 969.
[4] As with Cosmas, the life of Bogomil is shrouded in mystery and what little is known of him comes from the sermons written against him.
[6] The statement that Jeremiah was "a son (disciple) of Bogomil" may be an interpolation.