Sergios 107 was protospatharios and the brother of the patriarch Photios (Photios 1), six of whose surviving letters were addressed to him, none of which can be dated with certainty: Photius, Epp. 51, 55, 73, 145 (I 96ff., 115ff., II 1ff. Laourdas-Westerink) (all addressed Σεργίῳ ἀδελφῷ), 161, 200 (II 15ff., 97ff. Laourdas-Westerink) (both addressed Σεργίῳ πρωτοσπαθαρίῳ ἀδελφῷ). The letters concern themselves with matters of theology, morality and faith.

Sergios 107 was a patrikios and the husband of Eirene 4 (sister of the empress Theodora 2): Scyl., p. 98, 73ff. He was probably banished like the rest of the family in the reign of the emperor Theophilos 5 for supporting the veneration of icons contrary to imperial orders; cf. Synax. Eccl. Const. 682, 18ff. (unnamed), Menol. Bas. 453D (unnamed). If he is identical with the unnamed husband of Eirene recorded in Theoph. Cont. IV 22, he was already dead by 855, since Eirene 4 was already a widow during the regency of Theodora 2. The husband of Eirene 4 may however have been an uncle of Photios 1, not a brother; see Sergios 44 and Eirene 6.

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