There was confusion in some sources, between Alice de Cheyne, wife of Gilbert de Saye, and her grandmother Alice Maminot, sister of Walkelin Maminot, and the wife of Ralph de Chesney.
This is explained on Chris Phillips' Medieval Genealogy website, on its Complete Peerage corrections page: [2]
John de Chesney was the son of Ralph de Chesney, and the grandson of another Ralph. The cartulary of Merton Priory records that Hugh Maminot gave the manor of Petham (Kent) to Ralph de Chesney in marriage with his daughter Alice [L. F. Salzman, Sussex Arch. Coll., vol. 65, pp. 21, 22 (1924), citing British Library Cotton MS Cleopatra C VI, no 69].
Chronologically, this would be John's father rather than his grandfather.
(As Salzman points out, according to a Lewes manuscript, Ralph was predeceased by a wife named Emma - Dugdale, Monasticon Anglicanum, vol. 5, p. 14 (1817-30 edn) - so it is possible that the Merton cartulary is wrong in calling Hugh Maminot's daughter Alice - Keats-Rohan (Domesday Descendants, p. 369) apparently takes this view.)
Sources
↑ Cawley, Charles. Medieval Lands: A prosopography of medieval European noble and royal families. Hosted online by the Foundation for Medieval Genealogy (FMG), accessed 2024, Maminot.
↑ "Some corrections and additions to the Complete Peerage: Volume 11: Say" Medieval Genealogy.
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Keats-Rohan seems to think her name was Emma. Domesday Descendants, p.1027. Alice seems to be the name of another Maminot, niece to Emma, who married Geoffrey de Say d.1214. (Also in Sanders.) Complete Peerage seemed to combine Emma and Alice. Our Geoffrey currently has no less than 3 wives who are clearly all meant to connect somewhere to the Maminots. Say-23
Please tell me your source(s) for this person being the wife of Geoffrey de Say. According to Magna Carta Ancestries by Douglas Richardson, publ. 2005, as well as a 10 Nov 2007 posting of Douglas Richardson re: Geoffrey de Say on Gen-Medieval, the (2nd) wife of Geoffrey de Say was Alice de Vere, daughter of First Earl of Oxford, Aubrey de Vere III (c 1110-1194) and Countess of Oxford Agnes de Essex. Per the same sources, Geoffrey's first wife was Alice de Cheyne.