Born, about the middle of the first century, a.d., in Hierapolis, Phrygia; originally a slave, but became a freedman of Epaphroditus, a favorite of the emperor Nero; a pupil of Musonius Rufus; taught philosophy at Rome; banished with other philosophers by Domitian and settled in Nicopolis, Epirus, where he taught philosophy, his doctrines being compiled by his pupil Arrian, the historian; he wrote nothing himself.