Germanus I was an ethnic Latin who was the Patriarch of Constantinople from 715 to 730. He is regarded as a saint by both the Orthodox and Roman 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 Constantine II of Constantinople.

Cyzicus was an ancient Greek town in Mysia in Anatolia in the current Balıkesir Province of Turkey. It was located on the shoreward side of the present Kapıdağ Peninsula, a tombolo which is said to have originally been an island in the Sea of Marmara only to be connected to the mainland in historic times either by artificial means or an earthquake.