According to the history of John Skylitzes, he was a relative of the celebrated 9th-century patriarch Photius I.[1] In 1001, he was abbot of the Monastery of Manuel, which had been re-founded by Photius I, when he was elected to fill the patriarchal see (June/July 1001).[1]
According to the later legend, Sergius II was in the conflict with the Pope Sergius IV.[2]
According to John Skylitzes, he died in July 1019. His successor was Eustathius.[1]
↑The Editors of Encyclopædia Britannica, Sergius II "A story that Pope Sergius IV (1009–1012) sent Sergius II, a letter insisting on the Latin Trinitarian teaching that the Holy Spirit relates to both Father and Son (Filioque), thus initiating the Eastern schism when Patriarch Sergius II reacted by erasing the Pope's name from the Byzantine prayer intercessions, is the invention of 12th-century controversialists".