Biography
Margaret de Quincy was born circa 1218 to Roger de Quincy (c1195-1264) and Helen de Galloway (c1215-aft1245) and died before 12 March 1284 of unspecified causes. She married William de Ferrers, 5th Earl of Derby (c1193-1254) 1238 JL .
Children
| Name | Birth | Death | Joined with |
| Robert de Ferrers, 6th Earl of Derby (1239-1279) | 1239 | 1279 | Marie de Lusignan (-aft1266) Alianor de Bohun (c1240-1314) |
| William de Ferrers | |||
| Joan de Ferrers (?-1309) | 1248 Derbyshire, England | 19 March 1310 Berkeley Castle, Gloucestershire, England | Thomas de Berkeley (c1250-1321) |
| Agnes de Ferrers | |||
| Elizabeth de Ferrers (c1250-c1300) | 1250 England, United Kingdom | 1300 England, United Kingdom | William Marshall (-c1264) Dafydd ap Gruffydd (1238-1283) |
Footnotes (including sources)
| ‡ General |
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