Ishoʿyahb V was Patriarch of the Church of the East from 1149 to 1175.
Brief accounts of Ishoʿyahb's patriarchate are given in the Ecclesiastical Chronicle of the Jacobite writer Bar Hebraeus (floruit 1280) and in the ecclesiastical histories of the fourteenth-century Nestorian writers ʿAmr and Sliba.
The following account of Ishoʿyahb's patriarchate is given by Bar Hebraeus:
Then Ishoʿyahb, an old and chaste man from Balad, who had formerly been bishop of Hirta, was made catholicus, for he was chosen by a certain famous doctor named Abu Mansur, son of a wise scribe. He was consecrated on the second Sunday of the Dedication of the Church, in the year 542 [AD 1147], and after he had fulfilled his office for twenty-eight years, he died on the night of the second Sunday after Ascension, on the twenty-fifth day of iyyar [May], in the year 570 of the Arabs [AD 1174]. He was succeeded by Eliya, known as Abu Halim.
- Bar Hebraeus, Ecclesiastical Chronicle (ed. Abeloos and Lamy), ii. 330
- Abbeloos, J. B., and Lamy, T. J., Bar Hebraeus, Chronicon Ecclesiasticum (3 vols, Paris, 1877)
- Assemani, J. A., De Catholicis seu Patriarchis Chaldaeorum et Nestorianorum (Rome, 1775)
- Brooks, E. W., Eliae Metropolitae Nisibeni Opus Chronologicum (Rome, 1910)
- Gismondi, H., Maris, Amri, et Salibae: De Patriarchis Nestorianorum Commentaria I: Amri et Salibae Textus (Rome, 1896)
- Gismondi, H., Maris, Amri, et Salibae: De Patriarchis Nestorianorum Commentaria II: Maris textus arabicus et versio Latina (Rome, 1899)
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