Question: When did Thomas Stafford, 3Rd Earl Of Stafford's mother die?
Sentence (from "Thomas Stafford, 3rd Earl of Stafford"): Thomas Stafford, 3rd Earl of Stafford (c. 1368–4 July 1392) was the second son—but the senior surviving heir—of Hugh Stafford, 2nd Earl of Stafford and Philippa de Beauchamp, daughter of Thomas de Beauchamp, 11th Earl of Warwick.
Relevant evidence: Yes