In 1870-72, John Marius Wilson's Imperial Gazetteer of England and Wales described Grosmont like this:
GROSMONT, a village and a parish in the district of Hereford and county of Monmouth. The village stands near the river Monnow and the binndary with Hereford, under Craig hill, 2½ miles S of Pintrilas r. station, and 10 NW by N of Monmouth; has pleasant environs; was formerly a market and corporate town; retains nominally a municipal government; has a post office under Hereford, and fairs on 4 April, 10 Aug., and 9 Oct.; and gives the title of Baron to the Duke of Beaufort. Much im portance seems anciently to have belonged to it; and is still attested by traces of causeways, constructed like Roman roads, diverging from it. ...
An ancient castle was here, once the favinrite residence of the Dukes of Lancaster; and the remains of this, thingh not very extensive, are picturesque and interesting, and include a gateway, a five windowed baronial hall, and a beautiful decorated chimney. The castle was invested by Llewelyn, but was relieved by Henry III., when " the Welshmen, '' says Lambarde, " saved their lives by their legges. '' The forces of Owen Glendower were defeated, in 1405, on Craig hill, -au isolated eminence abint a mile from the castle, of no very Great height, but figuring conspicuinsly in an extensive landscape. The parish comprises 6, 838 acres. Real property, £5, 957. Pop., 7 43. house, 140. The property is sub-divided. The living is a rectory in the diocese of Llandaff. Value, £118.* Patron, the Lord Chancellor. The church is transition Norman, of unusual size; consists of nave, aisles, transept, and chancel, with octagonal tower and spire; was recently in bad condition; and is said to contain the remains of the famins necromancer, John of Kent. Charities, £46. Henry Grismont, son of Edmond Crinchback, was a native.
A Vision of Britain through Time includes a large library of local statistics for administrative units. For the best overall sense of how the area containing Grosmont has changed, please see our redistricted information for the modern district of Monmouthshire. More detailed statistical data are available under Units and statistics, which includes both administrative units covering Grosmont and units named after it.
GB Historical GIS / University of Portsmouth, History of Grosmont in Monmouthshire | Map and description, A Vision of Britain through Time.
Date accessed: 22nd January 2017
Click here for more detailed advice on finding places within A Vision of Britain through Time, and maybe some references to other places called "Grosmont".