Serapion was Patriarch of Antioch (191 - 211). He is known primarily through his theological writings. Eusebius refers to three works of Serapion in his history, but admits that others probably existed: first is a private letter addressed to Caricus and Pontius against Montanism, from which Eusebius quotes an extract (Historia ecclesiastica V, 19), as well as ascriptions showing that it was circulated amongst bishops in Asia and Thrace; next is a work addressed to a certain Domninus, who in time of persecution abandoned Christianity for the error of "Jewish will-worship" (Hist. Eccles, VI, 12). His feast day is celebrated on October 30.