Charter of William, son of Geoffrey de Say, and Avice de Clare
O'Connor Cal. Cartularies of John Pyel & Adam Fraunceys (Camden Soc. 5th Ser. 2) (1993): 240). < [https://ancestors.i...
People: Hawise de Clare, Geoffrey de Say, V and William III de Saye, Governor of Rochester Castle, Lord of West Greenwich
Geoffrey de Say’s entry in “Magna Carta Ancesfry”
Douglas Richardson. Magna Carta Ancestry: A Study in Colonial and Medieval Families, 4 vols., ed. Kimball G. Everingh...
People: Hawise de Clare, Richard de Clare, 3rd Earl of Hertford, Surety of the Magna Carta, Amice, 4th Countess of Gloucester and 5 others.
https://fabpedigr...
People: Saher de Saye
Picot Lascelles Source Notes and Queries.pdf
This source states that Sir Humphrey was the son of Picot de Lascelles; other son's are mentioned as well.
People: Sir Humphrey de Lascelles of Hinderskelfe Castle, kt and Picot de Lascelles, I, High Sheriff of Cambridgeshire
Herve Avenel doc.pdf
This document shows that the de Say family descended from the family of "Avenel".
People: Hervé Avenel, I, Hervé Avenel, II, Sigemberg des-Biarz Avenel and 3 others.