Epiphanius (born 310 in Palestine, died on Cyprus 402) was a Church Father and strong defender of orthodoxy, known for tracking down deviant teachings (heresies) wherever they could be traced. During a visit to Palestine in 394 he attacked Origen's followers and urged the bishop of Jerusalem to condemn his writings. Origen's writings were eventually condemned at the Fifth Ecumenical Council.
His most well-known book is Panarion which means "Medicine-chest" (also known as Adversus Haereses), a handbook for dealing with heretics, listing 80 heretical doctrines, some of which are not described in any other surviving documents from the time. This book was only recently (1987) translated into English.