In the Welsh town of Monmouth, in the county of Monmouthshire, hiding down a narrow street on a hill above the River Monnow are the remains of the scheduled monument that is Monmouth Castle. It was established by William FitzOsbern between 1066 and 1069 as a counterpart to his other major castle at Chepstow. Once an important border castle, and the birthplace of Henry V of England on the 16 September 1386. It stood proudly until it was damaged during the English Civil War. Eventually, it was slighted, putting it beyond military use.