MONMOUTH, the capital of the county of Monmouthshire in England. It has its name from its situation at the conflux of the Monow, or Mynewy, and Wye. Here was a castle in William the Conqueror's time, which Henry III. took from John baron of Monmouth. It afterwards came to the house of Lancaster, who bestowed many privileges upon the town. Here Henry V. surnamed of Monmouth, was born. The famous historian Geoffrey was also born at this place. Formerly it gave the title of earl to the family of Carey, and of duke to king Charles the second's eldest natural son; but now of earl to the Mordaunts, who are also earls of Peterborough. It is a populous and well-built place, and carries on a considerable trade with Bristol by means of the Wye. W. Long. 2. 30. N. Lat. 51. 47.