Gelasios 1 | Prosopography of the Byzantine Empire |
| Sex | M |
| Floruit | L VIII/E IX |
| Dates | 799 (tpq) / 814 (taq) |
| PmbZ No. | 1944 |
| Religion | Christian |
| Locations | Stoudios (Monastery of, Constantinople) (residence); Stoudios (Monastery of, Constantinople) |
| Occupation | Monk |
| Textual Sources | Theodorus Studita, Epistulae, ed. G. Fatouros, CFHB 31.1-2 (Berlin/New York, 1992) (letters) |
Gelasios 1 was a Stoudite monk; he was the addressee of a letter from Theodoros 15 (Theodore the Stoudite) written between 799 and 814; he had apparently left the monastery; Theodoros calls him his disciple and addresses him as Ὦ τέκνον μου, ἀββᾶ Γελάσιε: Theod. Stud., Ep. 9, p. 30, line 3 (addressed Γελασίῳ μαθητῇ: p. 30, line 1). He is probably to be identified with an unnamed monk who had left the monastery and is alluded to in a letter of Theodoros written about the same time to Symeon 24: Theod. Stud., Ep. 8, pp. 27-29 (mentions τοῦ λιποτακτήσαντος ἀδελφοῦ ἡμῶν: p. 27, line 8).
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