Sissinios 1 was brother of Niketas 11: Theoph. AM 6295 (Νικήτα, πατρικίου καὶ δομεστίκου τῶν σχολῶν, καὶ Σισιννίου, πατρικίου καὶ ἀδελφοῦ αὐτοῦ). The family name was Triphyllios: Theoph. AM 6295 (τῶν ἐπιόρκων καὶ δολερῶν Τριφυλλίων), and see Niketas 11. Cf. Winkelmann, Quellenstudien, pp. 156, 185. On Easter Monday (1 April) 799 he was one of four patrikioi who led the four white horses which drew the carriage of the empress Eirene (Eirene 1) from the Holy Apostles in procession (ὑπὸ τεσσάρων πατρικίων; the others were Bardanes 3, Konstantinos 16 and Niketas 11); at the time he held office as strategos of Thrace (Σισιννίου, στρατηγοῦ τῆς Θρᾴκης): Theoph. AM 6291. On 31 October 802, he was patrikios; he and his brother Niketas 11 were among those who supported the overthrow of the empress Eirene 1 by Nikephoros 8 (Νικήτα, πατρικίου καὶ δομεστίκου τῶν σχολῶν, καὶ Σισιννίου, πατρικίου καὶ ἀδελφοῦ αὐτοῦ): Theoph. AM 6295. He was probably succeeded as strategos of Thrace by Leo 12 in 801 or 802. He was still patrikios in 811 when he accompanied the expedition led by the emperor Nikephoros I (Nikephoros 8) against the Bulgars; he was among the leading persons (τῶν σὺν αὐτῷ μεγιστάνων) who lost their lives in the Roman defeat on 26 July when the emperor Nikephoros perished: Theoph. AM 6303 (Σισίννιος πατρίκιος ὁ Τριφύλλης).

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