Geoffrey Alselin (birthdate unknown) was an English Lord of Elvaston, Derbyshire and Laxton, Nottinghamshire who came to power sometime after the Norman invasion of England and victory at the Battle of Hastings.
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Alselin began the construction of the Motte-and-Bailey castle that stood at Laxton, Nottinghamshire, although it would not be completed until after Alselin's son-in-law, Robert de Caux, was appointed the hereditary Keeper of the Royal Forests of Nottingham.
Lexington was a member of a prominent family whose name came from the village of Lexington, now Laxton, in Nottinghamshire.
Laxton Castle is a late 11th- or early 12th-century medieval castle located north of the village of Laxton in Nottinghamshire, England.
His father for a time administered the manor of Laxton (formerly Lexington, from whence the family's name derived.
The Motte-and-bailey castle first built on the spot seems to have been constructed very soon after the Norman Invasion, perhaps under order of Geoffrey Alselin who was granted the property in 1066, though more likely under order of Alselin's son-in-law, Robert de Caux, who used Laxton as his seat after Alselin's death.