in ecclesiastical history, the name of a fanatical sect which sprang up in the Greek and eastern churches towards the close of the 12th century: the fanatics of this denomination professed to believe in a double Trinity, rejected wedlock, abstained from flesh, treated with the utmost contempt the sacraments of baptism and the Lord's supper, and all the various branches of external worship; placed the essence of religion in internal prayer alone; and main- Leucopetrus, and his chief disciple Tychechus, who corrupted, by fanatical interpretations, several books of Scripture, and particularly St Matthew's Gospel.