Ibas (d. October 28, 457) was bishop of Edessa (c.435 - 457) and was born in Syria. His name in Syriac is Ihiba or Hiba = Donatus. He is frequently associated with the growth of Nestorianism, although his recorded acts do not support this reputation.
He appears first as a presbyter of the church of Edessa during the episcopate of Rabbula, warmly espousing the theological views which his bishop uncompromisingly opposed. He admired the writings of Theodore of Mopsuestia, which he translated into Syriac and diligently disseminated through the East.
The famous theological school of Edessa, of which, according to some accounts, Ibas was head, and to which the Christian youth from Persia and adjacent lands came for education, offered many opportunities for propagating Theodore's beliefs. The growing popularity of doctrines which appeared clearly heretical alarmed Rabbula, and he endeavored to get Theodore's works anathematized and burnt. However the church of Edessa was generally favorable to Theodore's teaching, and supported Ibas against their bishop.
Ibas attended the Council of Ephesus in 431 as a presbyter, was cognizant of Cyril's autocratic conduct, and wrote in 433 the letter to Maris, bishop of Hardaschir in Persia, a letter which later became one of the Three Chapters. Maris had been at Edessa previous to the Nestorian controversy, and Ibas wrote to tell him what had occurred since his visit. Though evidently written under great exasperation, it shows Ibas as a man of independent judgment, and free from partisanship. In the letter, Nestorius is severely censured for refusing the title Theotokos to the Virgin Mary, and Ibas accuses Cyril of Apollinarianism, and denounces the heresy of his 12 chapters, charging him with maintaining the perfect identity of the manhood and Godhead in Christ, and denying the Catholic doctrine of the union of two Natures in One Person (Philippe Labbe, iv. 661, v. 510).
When Rabbula died in 435 or 436, Ibas was elected his successor. This was distasteful to those who held the strong anti-Nestorian views of their late bishop, and they speedily planned to secure his deposition, by spreading charges against him of openly preaching heretical doctrines. The accusations soon reached the ears of Theodosius II and Archbishop Proclus of Constantinople. To Proclus the matter appeared so serious that towards the close of 437 he wrote to John I of Antioch, as the leading prelate of the East, though really having no canonical jurisdiction over Osrhoene, begging him to persuade Ibas, if innocent, to remove the scandal by condemning publicly certain propositions chiefly drawn from Theodore's writings against the errors of Nestorius. The same demand was made by Proclus of all the Eastern bishops; but Ibas and the other bishops generally refused to condemn Theodore's propositions (ibid. v. 511-514).
Although blocked so far, the malcontents at Edessa continued to work against their bishop. Their leaders were four presbyters, Samuel, Cyrus, Eulogius, and Maras, who acted at the instigation of one of Ibas's own suffragans, Uranius, bishop of Himeria, a pronounced Eutychian. While Domnus II, who had in 442 succeeded his uncle John I of Antioch as Patriarch of Antioch, visited Hierapolis Bambyce for the enthronization of the new bishop Stephen, Ibas' opponents chose that moment for action. Cyrus and Eulogius formally laid before Domnus the accusation against Ibas, signed by about 17 clergy of Edessa, and supported by 30 (ibid. iv. 658). Ibas, starting his journey for Hierapolis Bambyce to pay his respects to Domnus, learned of the accusation, at once summoned his clergy, pronounced excommunication on Cyrus and Eulogius as calumniators, and threatened the same treatment to all who participated in their proceedings.
Eulogius and Maras then hastened to join their companions in Constantinople, where they found a powerful party strongly hostile to the Eastern bishops, Theodoret in particular. Their faction was soon strengthened by the arrival of Uranius, and half a dozen more Edessene clergy. The emperor and Flavian, who had succeeded Proclus as archbishop, listened to their complaints, but declined to hear them officially. The case was remitted to the East, and by an imperial commission, dated October 26, 448, Uranius of Himeria, Photius of Tyre, who was elected September 9, 448, on the deposition of Irenaeus, and Eustathius of Beirut were deputed to hear it, and Damascius, the tribune and secretary of state, was dispatched as imperial commissioner. The whole proceeding was contrary to the canons that bishops should be subjected to the judgment of other bishops, two belonging to another province, on the strength of an imperial decree. No one, however, protested: imperial power was regarded as absolute. The tribunal also was grossly unfair. One of the three judges, Uranius, was ringleader of the movement against Ibas; the other two had obtained their sees by the instrumentality of Uranius (Martin, Le Brigandage d'Ephèse, pp. 118-120).
Tyre was named as the place of trial. The accusations raised against Ibas were so inflammatory that the hearing was moved to Eustathius's episcopal residence in Beirut to avoid disturbances (Labbe, iv. 636). In response to the indictment, Ibas laid before his judges a memorial signed by many of his clergy, denying that he had ever uttered the alleged blasphemies (ibid. iv. 667-671). Only three witnesses supported the accusation, and brought forward a copy of the celebrated letter to Maris (ibid. iv. 659-662). The commissioners, avoiding any judicial decision, brought about a friendly arrangement.
His enemies agreed to withdraw their accusations on lbas promising that he would forget the past, regard his accusers as his children, and remit any fresh difficulty for settlement to Domnus; and that, to avoid suspicion of malversation, the church revenues of Edessa should be administered, like those of Antioch, by oeconomi. Ibas gave equal satisfaction on theological points. He engaged to publicly anathematize Nestorius and all who thought with him on his return, and declared the identity of his doctrine with that agreed upon by John and Cyril, and that he accepted the decrees of Ephesus equally with those of Nicaea as due to the inspiration of the Holy Spirit. The concordat was signed, Uranius alone dissenting, February 25, 449 (ibid. iv. 630-648).
The truce was broken within a very few weeks. The Eutychian party was aided by the intrigues of Chrysaphius, Dioscorus, and their partisans to obtain an edict summoning a further General Council at Ephesus for August 1, 449. Although the council was intended to rehabilitate the reputation of Eutyches, it served as a weapon against Ibas. Reports diligently spread in Edessa during his absence of Ibas's heterodoxy made his reception so hostile that he was obliged to leave the town and request the magister militum for a guard to protect him. He soon discovered that all appeal to the civil power was in vain. The count Chaereas was governor of Osrhoene, but had secret instructions from Chrysaphius and Eutyches to arrest and imprison him and reopen the suit. When Chaereas entered Edessa on April 12, 449, to commence the trial, he was met by a mob of abbots and monks and their partisans, clamoring for the immediate expulsion and condemnation of Ibas and his followers. Two days later the inquiry began with Ibas absent and a mob agitating for his condemnation. All Edessa knew that Chaereas had come merely to announce a sentence of condemnation already passed.
Chaereas, however, was moving too slowly for their hatred, and on Sunday, April 17, the excitement in church was so violent that the count was compelled to promise that the verdict of the synod of Beirut should be reviewed and a new investigation commenced. This began on the next day; all the old charges were reproduced by the same accusers, amid wild yells of "Ibas to the gallows, to the mines, to the circus, to exile" drowning every attempt at explanation or defence. Chaereas, as had been predetermined, addressed a report to the imperial government, declaring the charges proved; and on June 27 the emperor, acknowledging the receipt of the document, ordered that a bishop who would command the confidence of the faithful should be substituted for Ibas (Perry, The Second Synod of Ephesus). Only a legally constituted synod could depose him, but meanwhile his enemies' malice could be gratified by his maltreatment. He was forbidden to enter Edessa, apprehended and treated as the vilest of criminals, dragged about from province to province, changing his quarters 40 times and being in 20 different prisons (Labbe, iv. 634; Liberat.c. 12; Facund. lib. vi. c.i).
The council of Ephesus opened on August 3. One of its objects was to get rid finally of Ibas, which was the work of the second session, held on August 22. The three bishops who had conducted the investigation at Tyre and Beirut were asked for an account of their proceedings; they avoided reporting Ibas' acquittal, stating that the investigation that was later made at Edessa would be more useful. The monks of Edessa and the other parties to the indictment were admitted, and asked for their report, which condemned Ibas as expected. The motion of deposition carried without objection, Eustathius of Beirut and Photius of Tyre, who had previously acquitted him on the same evidence, voting with the majority. Ibas was not called to appear, being then in prison at Antioch (Labbe, iv. 626, 634).
It is not clear what befell Ibas on his deposition. At the beginning of 451 the bishops who were deposed and banished as a consequence of the Second Council of Ephesus were allowed to return from exile, but the question of their restoration was left for the Council of Chalcedon. At the 9th session, October 26, the case of Ibas came before the assembled bishops. On his demand to be restored in accordance with the verdict of Photius and Eustathius at Beirut and Tyre, the Acts of that synod were read, and the next day the pope's legates gave their opinion that Ibas, was unlawfully deposed, and should be at once restored. After much discussion this was carried unanimously. The legates led the way, declaring his letter to Maris orthodox, and commanded his restitution. All the prelates agreed in this verdict, on the condition that he should anathematize Nestorius and Eutyches and accept the tome of Leo. Ibas consented without hesitation. "He had anathematized Nestorius already in his writings, and would do so again ten thousand times, together with Eutyches and all who teach the One Nature, and would accept all that the council holds as truth." On this he was unanimously absolved, restored as bishop of Edessa at the subsequent sessions. Nonnus, who had been chosen bishop on Ibas' deposition, having been legitimately ordained, was allowed to retain his episcopal rank, and on Ibas's death, October 28, 457, quietly succeeded him as metropolitan (Labbe, iv. 891, 917).
The fiction that Ibas had disowned the letter to Maris at Chalcedon (Gregory I Ep. 14), as Justinian claimed he did at Beirut, as having been forged in his name, is disproved by Facundus (lib. v. c. 2, lib. vii. c. 5). A controversy concerning his letter to Maris arose in the next century, in the notorious dispute about the "Three Chapters," when the letter - was branded as heterodox (together with the works of Theodore of Mopsuestia and Theodoret's writings in favour of Nestorius) in the edict of Justinian, and was formally condemned in 553 by the fifth general council, which pronounced an anathema, in bold defiance of historical fact, against all who should pretend that it and the other documents impugned had been recognized as orthodox by the council of Chalcedon (Evagrius H. E. iv. 38). Ibas is anathematized by the Syrian Orthodox Church as a Nestorian (Assemani, t. i. p. 202). According to the Chronicle of Edessa, Ibas erected the new church of the Apostles at Edessa, to which a senator gave a silver table of 720 lb. weight, and Anatolius, praefectus militum, a silver coffer to receive the relics of Thomas the Apostle, who was said, after preaching in Parthia, to have been buried there (Socr. H. E. iv. 18).