Germanus I of Constantinople

Germanus I of Constantinople (Latin: Germanus, Greek: Γερμανός; c. 634 – 740) was the Ecumenical Patriarch of Constantinople from 715 to 730. He is regarded as a saint by both the Orthodox and Catholic Churches, with a feast day of 12 May. He had been ecumenically preceded by Patriarch John VI of Constantinople, and was succeeded in Orthodox Rite by Patriarch Anastasius of Constantinople.

Notable works: On synods and heresies

Source: Wikipedia — https://en.wikipedia.org/wiki/Germanus_I_of_Constantinople