Imperial Birth and Forced Monasticism
Ignatius was born around 797–798 with the secular name Niketas, the son of Michael I Rangabe (emperor 811–813) and Empress Prokopia, and grandson of Emperor Nikephoros I. As a child of the reigning house he received a nominal appointment as commander of the Hikanatoi, an imperial guard corps.
In 813 Leo V the Armenian deposed Michael I. The new emperor had the fifteen-year-old Niketas castrated — rendering him ineligible for the imperial succession — and imprisoned him in a monastery. According to his vita, monastic life strengthened him in faith and piety. He took the name Ignatius, rose to become abbot of his monastery, and established three monasteries on the Princes' Islands in the Sea of Marmara. He was ordained by Basil, Bishop of Paros.
First Patriarchate and the Conflict with Bardas
After the death of the iconoclast emperor Theophilus, the Empress Theodora appointed Ignatius Patriarch of Constantinople on 4 July 847. He aligned himself with the strict Stoudite monks and, in the affairs of his see, deposed Gregory Asbestas, archbishop of Syracuse.
Ignatius came into open conflict with Bardas, the uncle of Emperor Michael III who effectively governed the realm. When Bardas refused to repent of his immoral conduct, Ignatius publicly excommunicated him. According to his vita, Bardas then sought to compel Ignatius to tonsure the Empress Theodora into monastic life; Ignatius refused. His vita relates that Bardas had Ignatius tortured over fifteen days to force his resignation. He was removed and sent into exile in 857. On Christmas Day, 24 December 858, Photius was consecrated patriarch in his place — a contested succession that Pope Nicholas I disputed.
Restoration and Death
The political tide turned with the murder of Michael III and the accession of Basil I. Photius fell from favor and was removed from office in 867, and Ignatius was restored to the patriarchal throne on 23 November 867. In his second tenure he resisted papal claims over the Church of Constantinople and, by about 870, brought the church of Bulgaria back within Constantinople's ecclesiastical sphere.
Ignatius died on 23 October 877, at about the age of seventy-eight or seventy-nine. Photius, his former rival, was again named patriarch as his successor. Ignatius is commemorated on 23 October in both the Orthodox and Catholic calendars.