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.