Monmouth Castle, Medieval castle ruins in Monmouth, Wales.
Monmouth Castle is a medieval fortress with surviving sections of its Great Tower and Hall at the confluence of the River Wye and River Monnow. The remains stand within grounds accessible to visitors who want to see the remnants of this former stronghold.
William FitzOsbern founded this fortress between 1066 and 1069 as an earth and timber ringwork. The Domesday Book recorded its existence, marking it as an important medieval stronghold from the very beginning.
The birthplace of King Henry V in 1386 ties this place directly to English royal power and rule. This royal connection shaped how people viewed this location throughout the centuries.
The grounds allow external viewing from the parade ground near Monmouth's main street, making it easy to see what remains. The site is maintained by the Royal Monmouthshire Royal Engineers, so pathways and visible areas are kept accessible.
A 1673 building called Great Castle House was constructed on the original castle site and now serves as headquarters for one of Britain's last remaining militia regiments. This blend of medieval remnants and modern military history remains visible to anyone walking through the grounds.
Location: Monmouth
Inception: 1060s
Founders: William FitzOsbern, 1st Earl of Hereford
Elevation above the sea: 30 m
Part of: Norman Invasion of Wales
Address: Castle Hill, Monmouth NP25 3BS
Website: https://cadw.llyw.cymru/ymweld/lleoedd-i-ymweld/castell-trefynwy
GPS coordinates: 51.81245,-2.71668
Latest update: December 7, 2025 09:27
Monmouth Museum
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Shire Hall
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Great Castle House
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1–6 Priory Street
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Statue of Charles Rolls
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Castle and Regimental Museum - Monmouth
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Market Hall
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Kings Head Hotel
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Agincourt House
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The White Swan Inn
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Little Castle House, Monmouth
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Crown and Thistle Inn, Monmouth
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War Memorial of the Royal Monmouthshire Royal Engineers
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Shire Hall Museum
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4,Church Street, Monmouth
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No.5 Church Street, Monmouth
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7,Church Street, Monmouth
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3,Church Street, Monmouth
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No.2 Church Street, Monmouth
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6 Church Street, Monmouth
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8,Church Street, Monmouth
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1 Church Street, Monmouth
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13 Monnow Street, Monmouth
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15 & 17 Monnow Street, Monmouth
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31, Monnow Street, Monmouth
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The King's Head Hotel
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Lloyds TSB
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Two Telephone Call-boxes beside The Shire Hall
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