Stow Green Castle, also known as Castle Tump, was a castle near the village of St Briavels

St Briavels

St Briavels is a medium sized village and civil parish in the Royal Forest of Dean in west Gloucestershire, England; close to the England-Wales border, and south of Coleford. It stands almost above sea level on the edge of a limestone plateau above the valley of the River Wye, above an ancient...

 in Gloucestershire

Gloucestershire

Gloucestershire is a county in South West England. The county comprises part of the Cotswold Hills, part of the flat fertile valley of the River Severn, and the entire Forest of Dean....

, England

England

England is a country that is part of the United Kingdom. It shares land borders with Scotland to the north and Wales to the west; the Irish Sea is to the north west, the Celtic Sea to the south west, with the North Sea to the east and the English Channel to the south separating it from continental...

.

The castle is believed to have been built after the Norman Conquest

Norman conquest of England

The Norman conquest of England began on 28 September 1066 with the invasion of England by William, Duke of Normandy. William became known as William the Conqueror after his victory at the Battle of Hastings on 14 October 1066, defeating King Harold II of England...

. The castle was a small circular ring-motte fortification, once measuring 35 yards across, now only 25 yards, with a high motte

Motte

Motte may be:*Motte-and-bailey, a type of construction used in castles*Isaac Motte, an 18th century American statesman*La Motte , various places with this name-See also:* Mote * Mott...

, or mound, in the middle and a protective ditch around it. The entrance to the castle was on the south side of the fortification. The castle would have defended the Stowe valley, and was probably a precursor to the later St Briavels Castle in the same area.