When driven from the West, Julian and some of his fellow-exiles went into Cilicia and remained for a time with Theodorus, bishop of Mopsuestia, who is charged by Mercator with having been one of the originators of Pelagianism and who wrote against Augustine. Meanwhile, the rejoinder of Augustine had reached Julian, who answered it in 8 books, addressed to Florus, a fellow-recusant. Mercator has given various extracts, but it is best known from Augustine's elaborate "Opus Imperfectum", which was evoked by it, but left incomplete. On the death of Boniface I and the succession of Celestine I in September 422, Julian apparently left Cilicia and returned to Italy, probably hoping that the new pontiff might reconsider the case of the Pelagians, especially as a variance had then arisen between the Roman see and the African bishops. Celestine repulsed him, and caused him to be exiled a second time. Julian was also condemned, in his absence, by a council in Cilicia, Theodorus concurring in the censure). On this Julian went to Constantinople, where the same fate awaited him both from Atticus and his successor Sisinnius (426, 427 CE). On the accession of Nestorius to the patriarchate (428 CE) the expectations of Julian were again raised, and he appealed both to Nestorius and to the emperor Theodosius II. Both at first gave him some