From the longer Wikipedia page 
Richmond is a market town and civil parish on the River Swale in North Yorkshire, England and is the administrative centre of the district of Richmondshire. Historically in the North Riding of Yorkshire, it is situated on the edge of the Yorkshire Dales National Park, and serves as the park's main tourist centre. It is the most duplicated UK placename, with 57 occurrences worldwide.
Richmond was part of the lands of the earldom of Richmond, which was intermittently held by the Dukes of Brittany until the 14th century. When John V, Duke of Brittany died in 1399 Henry IV took possession of Richmond. In 1453, the earldom was conferred on Edmund Tudor, and became merged in the crown when Edmund's son Henry became king, as Henry VII in 1485.
See also: Earl of Richmond
The town website is .
For the Richmond now in Greater London see .