Ullerwood Castle is an early medieval castle, possibly a shell keep

Shell keep

A shell keep is a style of medieval fortification, best described as a stone structure circling the top of a motte.In English castle morphology, shell keeps are perceived as the successors to motte-and-bailey castles, with the wooden fence around the top of the motte replaced by a stone wall...

, in Ringway, 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 first referred to in 1173, in a document stating Hamo de Masci held the castles of Ullerwood and Dunham

Dunham Castle

Dunham Castle is an early medieval castle in Dunham Massey, England . The castle is first referred to in 1173, in a document stating Hamo de Masci held the castles of Dunham and Ullerwood. Documentary evidence suggests the castle at Dunham was still standing in 1323. The castle fell into disuse...

. There is no other contemporary documented reference to the castle. Ullerwood Castle has been confused with Watch Hill Castle

Watch Hill Castle

Watch Hill Castle is an early medieval motte-and-bailey on the border of Bowdon and Dunham Massey, England. It is the only Scheduled Ancient Monument in Trafford, and so is arguably the most important archaeological site in the borough...

 in nearby Bowdon

Bowdon, Greater Manchester

Bowdon is a suburban village and electoral ward in the Altrincham area of the Metropolitan Borough of Trafford, in Greater Manchester, England.-History:...

, but the two are separate castles, though both probably owned by de Masci. The site is underneath a house and surrounded by trees.