|Viļaka Castle ruins in 1797|
|Built by||Archbishopric of Riga|
Viļaka Castle (Latvian: Viļakas pilsdrupas) (Mariensee Castle, Marienhausen, Villack) is a castle in the historical region of Latgale, in eastern Latvia. The castle is located close to Viļaka town, on an island in the Viļaka Lake. Built by Archbishopric of Riga in 1342 as a wooden castle, rebuilt as a stone castle after 1516. The castle was destroyed in 1702 during the Great Northern War. The outer walls are 1.6m thick, remaining fragments of the walls are up to 2 meters high.
- Zarāns, Alberts (2006). Latvijas pilis un muižas. Castles and manors of Latvia. (in Latvian, English). Riga. ISBN 9984-785-05-X. OCLC 72358861.
- Krahe, Friedrich-Wilhelm (2000). Burgen des deutschen Mittelalters. Grundriss-Lexikon (in German). Flechsig. ISBN 3-88189-360-1.
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