Nikephoros I had been killed in battle and emperor Michael I Rangabe had been forced to abdicate. In June 813, a month before the coronation of Leo V, a group of soldiers broke into the imperial mausoleum in the Church of the Holy Apostles, opened the sarcophagus of Constantine V, and implored him to return and save the empire. Soon after his accession, Leo V began to discuss the possibility of reviving iconoclasm with a variety of people, including priests, monks, and members of the senate. He is reported to have remarked to a group of advisors that: all the emperors, who took up images and venerated them, met their death either in revolt or in war; but those who did not venerate images all died a natural death, remained in power until they died, and were then laid to rest with all honors in the imperial mausoleum in the Church of the Holy Apostles. Leo next appointed a "commission" of monks "to look into the old books" and reach a decision on the veneration of images. They soon discovered the acts of the Iconoclastic Synod of 754. A first debate followed between Leo's supporters and the clerics who continued to advocate the veneration of icons, the latter group being led by the Patriarch Nikephoros, which led to no resolution. However, Leo had apparently become convinced by this point of the correctness of the iconoclast position, and had the icon of the Chalke gate, which Leo III is fictitiously claimed to have removed once before, replaced with a cross. In 815 the revival of iconoclasm was rendered official by a Synod held in the Hagia Sophia. Leo was succeeded by Michael II, who in an 824 letter to the Carolingian emperor Louis the Pious lamented the appearance of image veneration in the church and such practices as making icons baptismal godfathers to infants. He confirmed the decrees of the Iconoclast Council of 754. Michael was succeeded by his son, Theophilus. Theophilus died leaving his wife Theodora regent for his minor heir, Michael III. Like Irene 50 years before her, Theodora presided over the restoration of icon veneration in 843, on the condition that Theophilus not be condemned. Since that time the first Sunday of Great Lent has been celebrated in the Orthodox Church and in Byzantine Rite Catholicism as the feast of the "Triumph of Orthodoxy". Arguments in the struggle