Grosnez Castle, Medieval castle ruins in Saint Ouen, Jersey.
The remaining granite walls of this clifftop fortification stand 16 feet tall on the landward side, featuring a gatehouse with arrow slits and defensive bastions.
Construction of the castle began in 1330 under Sir John des Roches during the Hundred Years' War to protect local farmers from French military attacks.
The name Grosnez originates from Norse words 'grar nes,' meaning grey headland, reflecting the island's Nordic linguistic heritage in Channel Islands toponymy.
The castle site offers clear views toward Alderney and other Channel Islands, with access to the ruins maintained by Jersey Heritage throughout the year.
The castle appears on Jersey's 50 pence coin, while its stones were repurposed in 1483 to strengthen the nearby Saint Ouen's Manor.
Location: Saint Ouen
Inception: 1330
Made from material: granite
GPS coordinates: 49.25755,-2.24680
Latest update: March 19, 2025 12:34
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