Achillas 1 | Prosopography of the Byzantine Empire |
| Sex | M |
| Floruit | M IX |
| Dates | 858 (taq) / 863 (tpq) |
| PmbZ No. | 75 |
| Religion | Christian |
| Locations | Stoudios (Monastery of, Constantinople); Stoudios (Monastery of, Constantinople) (residence); Constantinople (residence); Nakoleia (Phrygia); Stoudios (Monastery of, Constantinople) (officeplace); Nakoleia (Phrygia) (officeplace) |
| Occupation | Bishop; Hegoumenos |
| Titles | Archbishop, Nakoleia (Phrygia) (office); Bishop, Nakoleia (Phrygia) (office); Hegoumenos, Stoudios (Constantinople) (office) |
| Textual Sources | Vita Nicolai Studitae (BHG 1365), PG 105. 863-925 (hagiography) |
Achillas 1 was hegoumenos of the monastery of Stoudios at Constantinople, appointed by the emperor Michael III (Michael 11) and the Kaisar Bardas 5 in succession to Nikolaos 26 (in 858, after the dismissal of the patriarch Ignatios 1 and the withdrawal of Nikolaos 26 to Prainetos); described as an upright character: Vita. Nic. Stud. 909B (χειροτόνουσιν ἀντ' αὐτοῦ καθηγούμενον, Ἀχιλλᾶν μὲν οὖν ὀνομαζόμενον, χρηστὸν δὲ τοῖς τρόποις πανταχὸθεν ὑπάρχοντα). After five years as hegoumenos he was appointed archbishop of Nakoleia and was succeeded at Stoudios by Theodosios 43: Vita. Nic. Stud. 912B (ὁ δὲ προρρηθεὶς Ἀχιλλᾶς ἐν τῇ μονῇ τοῦ ὁσίου ἐπὶ πέντε χρόνους ἴθυνας τὸ ποίμνιον, ἀρχιεπίσκοπον εἰς Νακολίαν ἐν τοῖς τῆς ἀνατολῆς προχειρίζεται μέρεσιν).
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