Stephanos 11 was patrikios and domestikos of the Scholai in 811 (Στέφανος δὲ, πατρίκιος καὶ δομέστικος τῶν σχολῶν), when he accompanied the expedition led by the emperor Nikephoros 8 against the Bulgars; he was one of the leading persons to survive the great defeat of 26 July when the emperor was killed and it was he who with Theoktistos 2 proclaimed Nikephoros 8's son Staurakios 2 as emperor at Adrianople shortly afterwards; he at first opposed the proposal that Michael 7 should be proclaimed emperor, hoping that the gravely wounded Staurakios 2 would survive, but after returning to Constantinople the new emperor lost support by treating Stephanos 11, Theoktistos 2 and Michael 7 all badly, as well as his sister Prokopia 1; Stephanos 11 joined with the patriarch Nikephoros (Nikephoros 2) and Theoktistos 2, all formerly hostile to one another, in supporting Michael 7; after learning on 1 October that Staurakios 2 wanted to have Michael 7 assassinated, Stephanos 11 assembled the surviving troops of the tagmata and with their support the senate proclaimed Michael 7 emperor (as Michael I) on 2 October 811: Theoph. AM 6303.

Stephanos 11 is presumably identical with the unnamed megas domestikos (ὁ μέγας δομέστικος) who conferred with the emperor Michael I (Michael 7), together with the patriarch (Nikephoros 2) and the magistros (Theoktistos 2) and other patrikioi in Constantinople, after the defeat of Bersinikia; their plans were upset by the proclamation of Leo V (Leo 15) and the overthrow of Michael I: Scriptor Incertus 339-340.

(Publishable link for this person: )