He is honoured as a saint by the Eastern Orthodox and Roman Catholic churches, his feast day is May 23.
[1] By 787, when he attended the Second Council of Nicaea, Michael was already metropolitan bishop of Synnada, having been named to the position by Tarasios.
[2] Nikephoros used Michael and Peter, along with Gregory, the steward of Amastris, again as peace envoys in 806, when the Abbasid caliph Harun al-Rashid launched a large-scale invasion of Asia Minor.
Despite a warm reception at Aachen and the ratification of a peace treaty between the two realms, Charlemagne, perhaps wary after the repeated failures of successive efforts to that effect over the previous decades, hesitated to agree to such a match.
[1][4] On their way to Charlemagne's court, the embassy passed through Rome, where Michael handed over the synodika (enthronement letter) of Tarasios' successor, Patriarch Nikephoros I, to Pope Leo III.