Ioannes 521 | Prosopography of the Byzantine Empire |
| Sex | M |
| Floruit | M IX |
| PmbZ No. | 3233 |
| Locations | Thessalonike; Thessalonike (officeplace) |
| Occupation | Bishop |
| Titles | Archbishop, Thessalonike (office); Bishop, Thessalonike (office) |
| Textual Sources | Gouillard, J., "Le Synodikon de l'orthodoxie", TM 2 (1967), pp. 45-107 (liturgical) |
Ioannes 521 was named in a list of archbishops of Thessalonike in the Synodikon of Orthodoxy; he was the third archbishop recorded after Ioseph 3: Gouillard, "Synodikon", p. 114, IX, line 5.
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