Pope Mark was the bishop of Rome from 18 January to his death on 7 October 336. Little is known of Mark's early life. According to the Liber Pontificalis, he was a Roman, and his father's name was Priscus. Mark succeeded Sylvester I as pope on 18 January 336. Some evidence suggests that the early lists of bishops and martyrs known as the Depositio episcoporum and Depositio... Wikipedia