Historically, Berkshire has been bordered to the north by the ancient boundary of the River Thames. However, much of the border with Oxfordshire for the western part of the county was moved in 1974.
Alfred the Great was born in Wantage, previously in Berkshire but now in Oxfordshire. The Great Western Railway reached Didcot in 1839. MG (part of Morris Motors) was founded in Abingdon in 1929.
The Vale of White Horse and parts of Oxfordshire south of the River Thames were previously part of Berkshire, but were lost to the county in 1974. Conversely, the Slough area north of the Thames was historically part of Buckinghamshire, but was transferred to Berkshire in 1974.
Important historical abbeys include Abingdon Abbey and Reading Abbey.
Oscar Wilde was imprisoned in Reading Gaol after his court case.
1. The county is known as the Royal County of Berkshire since the Royal residence of Windsor Castle is in the county. Politically, the county is now made up of unitary authorities.
During the Heptarchy Berkshire formed part of the kingdom of Wessex, and interesting relics of Saxon occupation have been discovered in various parts of the county. Of these the most remarkable are the burial grounds at Long Wittenham and Frilford, and there is evidence that the Lambourn valley was occupied in early Saxon times. The cinerary urns found in Berkshire undoubtedly contain the ashes of the Anglians who came south under Penda in the 7th century. The fortification called Cherbury Castle, not far from Denchworth, is said to have been first made up by King Canute.