Gregorios 57 was basilikos protospatharios and baioulos of the despotes; owner of a seal dateable to the mid or late ninth century: Seibt, Bleisiegel I, no. 43. Obv.: Κ(ύρι)ε βοήθ(ει) τῷ σῷ δούλῳ. Rev.: Γριγο(ρίῳ) β(ασιλικῷ) (πρωτο)σπαθ(αρίῳ) (καὶ) βαιλο(υ) τοῦ φιλοχ(ρίστο)υ ἡ[(μῶ)ν] δεσπό[τ(ου)].

Gregorios 57 is identifiable with Gregorios baioulos attested in Italy from 876 to 885: see Lupus Protospatharius, p. 51 s.a. 875 (recte 876, see V. von Falkenhausen, Untersuchungen über die byzantinische Herrschaft in Süditalien vom 9. bis ins 11. Jahrhundert (Wiesbaden, 1967), p. 19, n. 128; stratico and baiulus, i.e. strategos and baioulos, in command of Byzantine troops stationed at Otranto, he entered Bari) and also see letters of pope John VIII (872-882) (MGH, Epp. VII, p. 45, no. 47, p. 142, no.177, p. 148, no. 185) (where he is styled "imperialis paedagogus" and "gloriosus primicerius") and Trinchera, Syllabus Graecarum Membranarum, p. 1, no. 1 (in March 885, he styled himself "primicerius imperialis protospatharius et bajulus").

As a primikerios Gregorios 57 was a eunuch. He was perhaps in charge of the upbringing of the sons of the emperor Basil I (Basilios 7), probably from 866 or 867, and was immediately succeeded in 875 or 876 by Photios 1. See Seibt, op. cit.., pp. 148-149 where this evidence is discussed.

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