Yohannan V was Patriarch of the Church of the East from 1000 to 1011.
Yohannan was bishop of al-Sin or Shenna when he was consecrated as archbishop of Fars by Patriarch Mari (r. 987–999). He ordained Elijah, the future archbishop of Nisibis, at the monastery of Mar Shemʿon in his role as bishop of Shenna on 15 September 994.
According to Bar Hebraeus:
After the catholicus Mari had fulfilled his office for fourteen years, he died in the first month of the year 390 of the Arabs, that is to say on the twenty-eighth day of the former kanun [December] in the year 1311 of the Greeks [AD 999]. He was succeeded by Yunanis II,[a] the metropolitan of Fars. This man, when he heard of the death of Mari, went to Shiraz, to the governor Baha al-Dawla, and won his support. Baha al-Dawla thereupon ordered that he should become catholicus. When the nobles of Baghdad heard that he had assumed the leadership uncanonically, by going to the governor's palace without being either elected or acclaimed, they were deeply offended, but were unable to oppose the edict. And so he was consecrated catholicus against the wishes of his people.
Bar Hebraeus also reported in his Ecclesiastical Chronicle that Abdisho, the Metropolitan of Merv,wrote and informed Catholicos Yohannan between 1007 and 1009 concerning the restoration of 200,000 Karaits to the Church of the East requesting directions concerning the observance of Lent for the Karaits lived almost exclusively on Milk and Meat and could not give up both. It is reported that Yohannan responded that a fast which we now call Molokan should be permitted to them.
- Bar Hebraeus called Yohannan V and his predecessor Yohannan IV (900–05) Yunanis, an alternative name for Yohannan more frequently used in the Syrian Orthodox Church than in the Church of the East. For Bar Hebraeus, therefore, he is the patriarch 'Yunanis II'. The Nestorian sources correctly style him Yohannan V.
Brief accounts of Yohannan's patriarchate are given in the Ecclesiastical Chronicle of the Jacobite writer Bar Hebraeus (floruit 1280) and in the ecclesiastical histories of the Nestorian writers Mari (twelfth-century), ʿAmr (fourteenth-century) and Sliba (fourteenth-century)
- 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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