Question: Who is Thomas Percy, 1St Earl Of Worcester's mother?
Sentence (from "Thomas Percy, 1st Earl of Worcester"): Thomas Percy, 1st Earl of Worcester, KG (134323 July 1403) was an English medieval nobleman and naval commander best known for leading the rebellion with his nephew Henry Percy, known as 'Harry Hotspur', and his elder brother, Henry Percy, 1st Earl of Northumberland.
Relevant evidence: Yes