In 626 during the absence of Emperor Heraclius on campaign against Sassanid Persia, the Avars laid siege to Constantinople. Along with the magister militum Bonus, he was in charge of the city's defense. He lead a litany to Panagia Hodegetria just before the final attack of the Avars, and right after completing it a huge storm crushed the invading fleet, saving Constantinople. The storm was credited as a miracle of the Virgin Mary.
Sergius I promulgated the belief that Jesus Christ had two natures but one will (Monothelitism). To this end, Sergius sent his archdeacon Peter to a synod in Cyprus in 634, hosted by Archbishop Arkadios II and with additional representatives from Pope Honorius. The anti-Monothelite side in Jerusalem, championed by Maximus the Confessor and Sophronius, sent to this synod Anastasius pupil of Maximus, George of Reshaina pupil of Sophronius and two of George's own pupils, and also eight bishops from Palestine. When the two sides were presented to the emperor, the emperor persisted with Monothelitism and so with Sergius.
- ↑ George of Reshaina, An Early Life of Maximus the Confessor, 316-7
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