Groot Poelgeest, Medieval castle ruins in Koudekerk aan den Rijn, Netherlands.
Groot Poelgeest is a medieval castle site in Alphen aan den Rijn featuring a polygonal tower from the former gatehouse and surrounded by a wide defensive moat. A coach house dating from 1648 stands along the Oude Rijn road and shows how the property was used in later centuries.
The castle was first mentioned in 1326 when the Lords of Poelgeest pledged it to the Count of Holland as a feudal estate. Over the following centuries it underwent various rebuildings and modifications before gradually falling into decline.
The castle served as a residence for a noble family whose presence shaped the local community for generations. The layout and design reflect building traditions common among regional estates of that era.
The ruins are visible year-round and easily accessible along the Oude Rijn road. Wear appropriate footwear since the site is outdoors and can be muddy or wet depending on weather conditions.
The round base layout of this castle was already unusual for the 14th century, suggesting the structure may have originated in the 13th century. This older design style set it apart from later castle-building traditions in the region.
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