David 13 was born in Mitylene, the eldest son of Hadrianos 7 and Konstanto 1; he was the brother of Symeon 13 and Georgios 135; during his childhood his future sanctity was foretold; at the age of nine he had a vision urging him to go to Mt Ida in the Troad; he lived there as a hermit for thirty years, from the age of sixteen; then, at the age of forty-six, in the twenty-second year of the reign of the emperor Constantine V (Konstantinos 7), i.e. in 762/763, he was moved by a vision to visit the bishop of Galgala (Gargara) (Anonymus 266) who consecrated him as a monk; he then founded an oratory of SS. Kyrikos and Iulitta at his former residence in the Troad; in his tenth year as a monk, when he was fifty-six, he was visited there by his mother and his brother Symeon 13 (in 772/773); he died at the age of sixty-six (in 782/783), two years after Symeon 13 was ordained priest: Acta Davidis, Symeonis et Georgii 212, 25-220, 5. If the dates are correct, he was born in 717/718, but the information in this Life is very untrustworthy. He and his brothers were celebrated as saints; see the "Akolouthia in the Codex laurentianus", in J. van den Gheyn, "Acta graeca Ss. Davidis, Symeonis et Georgii Mitylenae in insula Lesbo", Anal. Boll. 18 (1899), p. 212.

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