John VII of Constantinople
John VII was one of the most learned men in the Byzantine empire in his day. He tutored emperor Theophilus and was appointed by the latter to the throne of St Andrew in 836. He was an iconomach who, as Abbot of the Monastery of Sergius and Bacchus, had ordered all icons in the monastery destroyed. As patriarch, he continued those policies.
After John VII died, his remains were burnt by order of emperor Michael III.