Niketas 11 was the brother of Sisinnios 1: Theoph. AM 6295 (Νικήτα, πατρικίου καὶ δομεστίκου τῶν σχολῶν, καὶ Σισιννίου, πατρικίου καὶ ἀδελφοῦ αὐτοῦ), Leo Gramm. 200, 19. The family name was Triphyllios; the brothers are referred to by Theophanes as "the faithless and deceitful Triphyllioi" (τῶν ἐπιόρκων καὶ δολερῶν Τριφυλλίων) and "the Triphyllioi hateful to God" (τῶν θεοστυγῶν Τριφυλλίων) and Niketas is referred to as Niketas Triphyllios (Νικήτας ὁ Τριφύλλιος): Theoph. AM 6295, cf. Leo Gramm. 200, 19-20 (Νικήτα πατρικίου καὶ Σισιννίου τῶν αὐταδέλφων, τῶν ἐπιόρκων καὶ δολερῶν Τριφυλίων). On Easter Monday (1 April) 799 he was one of the four patrikioi who led the four white horses which drew the carriage of the empress Eirene 1 in procession from the Holy Apostles (ὑπὸ τεσσάρων πατρικίων; the others were Konstantinos 16, Bardanes 3 and Sisinnios 1); at the time he held office as domestikos of the Scholai (Νικήτα, δομεστίκου τῶν σχολῶν); after the empress fell ill in May 799 he was approached by the eunuch Aetios 1 (Ἀέτιος δὲ προσελάβετο Νικήταν, τὸν πατρίκιον καὶ δομέστικον τῶν σχολῶν) and they persuaded the empress that Staurakios 1 was plotting against her; Staurakios 1 with difficulty defended himself and escaped with his life and thereafter bore a grudge against Aetios 1 and Niketas 11: Theoph. AM 6291, Leo Gramm. 200, 8-17. In 800 he and Aetios 1 continued to oppose Staurakios 1 (who died in June 800): Theoph. AM 6292. On 31 October 802, he was patrikios and domestikos of the Scholai (Νικήτα, πατρικίου καὶ δομεστίκου τῶν σχολῶν); he and his brother Sisinnios 1 were among the rebels who helped Nikephoros 8 to overthrow the empress Eirene 1; they are abused by Theophanes 18 because previously they had flourished under Eirene 1 who had enriched them and to whom they had professed the greatest loyalty: Theoph. AM 6295, Leo Gramm. 200, 17-20. He died on 30 April 803; it was rumoured that he was poisoned by the emperor Nikephoros 8: Theoph. AM 6295 (Νικήτας ὁ Τριφύλλιος), Zon. XIV 14. 9 (he had supported the proclamation of the emperor Nikephoros 8), Leo Gramm. 202, 14-15 (Νικηταν δὲ τὸν Τριφύλιον ὁ αὐτὸς Νικηφόρος φαρμάκῳ ἀνεῖλε). Possibly identical with Niketas 117; if so, he also bore the title of basilikos protospatharios. According to Michael the Syrian Niketas 11 was informed by the empress Eirene 1 of the schemes of Aetios 1; he then took council with the unnamed patriarch (i.e. Tarasios 1) and the senate, and thy agreed that Nikephoros 8 should become emperor: Mich. Syr. III 12, cf. Bar Hebr., p. 120 (a patrician; he and the patriarch consulted the senate and decided that Nicephorus should become emperor in place of Eirene 1).

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