Kostales 1 | Prosopography of the Byzantine Empire |
| Floruit | E/M IX |
| PmbZ No. | 4151 |
| Titles | Basilikos protospatharios (dignity) |
| Seal Sources | Cheynet,J.-C., Morrisson, C. and Seibt, W., Les Sceaux byzantins de la Collection Henri Seyrig (Paris, 1991) |
Kostales 1 was basilikos protospatharios; owner of a seal dateable to the early or middle ninth century: Seyrig 56. The name and title read: Κωστάλῃ βασιλικῷ πρωτοσπαθαρίῳ.
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