Seedonis
| Name | Seedonis |
| Type | Sailing vessel |
| GRT | 284 tons |
| Country |  Russian |
| Built | 1895 |
| Builder | J. Popu, Jipka |
| Operator | Fr. Martinson, Riga |
| History | Wooden three-masted schooner. |
U-boat attacks on Sailing vessel Seedonis
| Date | U-boat | Loss type | Position | Location | Route | Cargo | Casualties | |
| 1 | 28 Dec 1916 | UC 34 (Robert Sprenger) | Sunk | off Lisbon | 38° 02'N, 10° 26'W | Garston - Seville |
Position of attack on Seedonis
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