13. Of XANTHOPULI, a monasteryapparently at or near Constantinople, was the friend of Callistus II., patriarch of Constantinople, who occupied that see about the close of the 14th or the beginning of the 15th century. Callistus had been amonk of the same monastery, and the two friends were united in the authorship of a work recommending a monastic life, and giving directions for it. The work is cited by their contemporary Symeon, archbishop of Thessalonica, in his (Allatius, De Symeonibus, p. 185, ed. Paris, 1664; Fabric. Bibl. Gr. vol. vii. p. 46.)

There were three Ignatii, respectively described as Chrysopolitanus Abbas, Metropolita Claudiopolitanus, and Lophorum Episcopus, among the correspondents of Photius, in the ninth century (Photius, Epistolae, ed. Montacutii); and an Ignatius Abbas (not to be confounded with No. 6) among the correspondents of Theodore Studita in the eighth or ninth century. (Theodorus Studita, Epistolae, lib. ii. ep. 24, apud Sirmond, Opera Varia, vol. v.) Several ancient Oriental writers and prelates of the name, Syrians or Armenians, are mentioned by Assemani in his The liturgies composed by some of these are given in a Latin version in Renaudot's Liturg. Orient. (Fabric. Bibl. Gr. vol. vii. p. 47.)