Brightwell Castle was in the village of Brightwell-cum-Sotwell

Brightwell-cum-Sotwell

Brightwell-cum-Sotwell is a twin-village and civil parish in the Upper Thames Valley in South Oxfordshire. It lies between Didcot to the west and the historic market town of Wallingford to the east...

, between the towns of Didcot

Didcot

Didcot is a town and civil parish in Oxfordshire about south of Oxford. Until 1974 it was in Berkshire, but was transferred to Oxfordshire in that year, and from Wallingford Rural District to the district of South Oxfordshire...

 and Wallingford , now in Oxfordshire

Oxfordshire

Oxfordshire is a county in the South East region of England, bordering on Warwickshire and Northamptonshire , Buckinghamshire , Berkshire , Wiltshire and Gloucestershire ....

 but until 1974 in Berkshire

Berkshire

Berkshire is a historic county in the South of England. It is also often referred to as the Royal County of Berkshire because of the presence of the royal residence of Windsor Castle in the county; this usage, which dates to the 19th century at least, was recognised by the Queen in 1957, and...

, in England.

The castle was built in 1145 by King Stephen

Stephen of England

Stephen , often referred to as Stephen of Blois , was a grandson of William the Conqueror. He was King of England from 1135 to his death, and also the Count of Boulogne by right of his wife. Stephen's reign was marked by the Anarchy, a civil war with his cousin and rival, the Empress Matilda...

. At the time there was civil war

The Anarchy

The Anarchy or The Nineteen-Year Winter was a period of English history during the reign of King Stephen, which was characterised by civil war and unsettled government...

 between himself and his cousin Matilda

Empress Matilda

Empress Matilda , also known as Matilda of England or Maude, was the daughter and heir of King Henry I of England. Matilda and her younger brother, William Adelin, were the only legitimate children of King Henry to survive to adulthood...

, whose headquarters were at nearby Wallingford Castle

Wallingford Castle

Wallingford Castle was a major medieval castle situated in Wallingford in the English county of Oxfordshire , adjacent to the River Thames...

. In 1153 the castle was destroyed by Matilda's son, who later became Henry II

Henry II of England

Henry II ruled as King of England , Count of Anjou, Count of Maine, Duke of Normandy, Duke of Aquitaine, Duke of Gascony, Count of Nantes, Lord of Ireland and, at various times, controlled parts of Wales, Scotland and western France. Henry, the great-grandson of William the Conqueror, was the...

.

A manor house

Manor house

A manor house is a country house that historically formed the administrative centre of a manor, the lowest unit of territorial organisation in the feudal system in Europe. The term is applied to country houses that belonged to the gentry and other grand stately homes...

now stands on the site.