Douglas Richardson, Royal Ancestry: A Study in Colonial and Medieval Families, 2nd edition (Salt Lake City, Utah, 2013), volume IV, page 562

5. GEOFFREY DE SAY, of Edmonton, Middlesex, Sawbridgeworth, Hertfordshire, Denham Suffolk, Saddlescombe, Sussex, Bellencombre, Etervlle, Fontaine-Etoupefour, Fresnay-le-Long, Les Moulineaux, Quesnai, and Til and Thieville in Normandy, etc., Bailiff of Arques, 1198, younger son. He married (1st) before 1180 ALICE (or ADELISE) DE CHEYNE, widow of Hugh de Periers, of Ditton Priors, Shropshire, and daughter and co-heiress of John de Cheyne, of Streat, Brighton, and Hamsey, Sussex. They had two sons, William and Geoffrey, Knt. His wife, Alice, was heiress in 1182 to her cousin, Walkekin de Maminot, of West Greenwich, Kent. In 1184 he owed £33 11s. for four measures of wheat which he had for provisioning the castle of Gisors. Sometime in or after 1185 he and his wife, Alice, granted the canons of St. Mary's, Bayham the advowson of the church of St. Nicholas, Greenwich, Kent. He married (2nd) ALICE DE VERE, daughter of Aubrey de Vere, Earl of Essex. They had one son, Geoffrey [2nd of name]. In 1198 he and his son, Geoffrey de Say, granted the wood of Periers and the church of St. Nicholas of Monnouval to the hospital of Drincourt, providing for prayers for the soul of Alice de Cheyne, mother of the younger Geoffrey, and for William her other son. GEOFFREY DE SAY died shortly before 19 May 1214.

Brydges Collins' Peerage of England 7 (1812): 16-39 (sub Twisleton, Lord Say and Sele). Baker History & Antiquities of the County of Northampton 1 (1822-1830): 544-545 (Mandeville-Fitz Peter-Bohun ped.). Clutterbuck Hist. & Antiqs. of Hertford 3 (1827): 190-194 (Mandeville-Say ped.). Sussex Arch. Colls. 9 (1857): 149-150. Lee Hist., Description & Antiquities of ... Thame (1883): 332 (Mandeville ped.). VCH Hertford 3 (1912): 29-33. Genealogist n.s. 34 (1918): 181-189. Fowler & Hughes Cal. of the Pipe Rolls of the Reign of Richard I for Buckinghamshire & Bedfordshire, 1189-1199 (Pubs. Bedfordshire Hist. Rec. Soc. 7) (1923): 211-213. Paget (1957): 485:2-3 (In 1210, he answered, apparently as heir, for the 27 knights fees of the barony of Wachelin Maminot, of Greenwich, Berling, etc., Kent, and confirmed the grants of the said Wachelin, whom he styles his ancestor, to Begeham Abbey). Sanders English Baronies (1960): 98. VCH Northampton 5 (2002): 176-197. Tanner, Fams., Friends, & Allies (2004): 302 (Mandeville ped.). Special thanks go to Chris Phillips for his identification of Alice de Cheyne, wife of John de Say, as the heiress of Walkelin de Maminot; see his website at http://www.medievalgenealogy.org.uk/cp/say.shtml.