From a thread on soc.genealogy, quoting
Domesday Descendents by KSB Keats-Rohan:
de Plesleia, Serlo
Held one fee of Hubert fitz Ralph in 1166 at Ashover, Derbyshire, held by his ancestor Serlo in 1086. Named from Pleasley, Derbyshire. His daughter or granddaughter Amabilis married John fitz John de Aincourt. He was dead by 1196, having made a grant to Felley for his burial there c. 1189/95
Later in the same thread:
Serlo, the Saxon, who held Ashover at the Survey under Fitzhubert, had two granddaughters (co-heiresses), who took the manor in moieties to their husbands - Willoughby, of Lincoln, and Deincourt, of Nottingham. The Lincolnshire Willoughbys were descendants of John, the Norman Knight, who fought at Hastings, and direct ancestor of the Barons Middleton, Willoughby de Eresby, Willoughby de Broke, and
Willoughby de Parham. The lads of this house distinguished themselves at Falkirk, with Edward I.; at Cressy, with Edward III.; at Poitiers, with the Black Prince; at Agincourt and Vernoil, with Henry N'.; at
Bosworth, with Richmond. But the Banks of the Amber were soon forsaken, and the lands exchanged for Pleasley with Isidore Reresby, who had married a daughter and co-heiress of Deincourt. This would be about
1282. The Reresbys would now be holding the entire manor, but from another co-heiress of Deincourt, who shared with her sister their father's moiety of Ashover and espoused Musters, of Nottinghamshire.
Footnotes
[1]
https://groups.google.com/g/soc.genealogy.medieval/c/6iEUxPeWe_o/m/Z4sRfXxpEqUJ
- Bef 1196