Sergios 11 was vir gloriosissimus, apo hypaton and patrikios; he was one of the laymen who attended the Third Council of Constantinople (the Sixth Ecumenical Council) in 680 and 681; he only attended those sessions at which the emperor himself was present (one to eleven and eighteen) and is named third in the list of laymen present on those occasions: Riedinger II 2. 14, line 22, 26, line 23, 36, line 4, 46, line 27, 160, line 25, 170, line 18, 180, line 22, 190, line 19, 262, line 19, 278, line 19, 400, line 19, 752, line 18 (= Mansi XI 209, 217, 221, 229, 317, 321, 328, 333, 380, 388, 456, 625). He is styled Σεργίου τοῦ ἐνδοξοτάτου ἀπὸ ὑπάτων πατρικίου; the old Latin version printed in Riedinger called him "Sergio glorioso exconsule patricio": Riedinger II 2. 15, line 21, etc. (= Mansi XI 210, etc.)

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