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> William de Ferrers, earl of Derby (d.1254)

You can cite this record using this snippet: PoMS, no. 7864 (https://poms.kdl.kcl.ac.uk/record/person/7864/; accessed 28 June 2025)

William de Ferrers, earl of Derby (d.1254)

Biography: married Margaret (d. 1281), eldest daughter and coheir of Roger de Quincy, earl of Winchester (d. 1264); son was William (d.1287)
Floruits: 1237 × 1237
PoNE: http://www.pone.ac.uk/record/person/561/

Total number of associated factoids: 4

Transaction factoids (1) Relationship factoids (1) Title factoids (1) Witnesses factoids (1)

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Date	Short Summary	Role	Witnesses	Source
10 Apr. 1209	Letter to King William concerning business between him and King John	named person (transaction)		1/25/6 (RLP, i, 91a)

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Date	Short Summary	Role	Source
10 Apr. 1209	Fidelis (sworn man) of John, king of England (d.1216) (Tenurial & lordship relationship)	subject (relationship)	1/25/6 (RLP, i, 91a)

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Date	Short Summary	Source
10 Apr. 1209	earl of Derby/Ferrars	1/25/6 (RLP, i, 91a)

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Date	Short Summary	Source
Friday 25 September 1237	Agreement between kings of England and Scotland (Treaty of York)	4/1/2 (A-S Relations, no. 7)