Thomas Percy (1560 - 1605)

It seems likely that Elizabeth Percy died in childhood at Alnwick, where Thomas was constable of the castle. In 1680 William Dugdale, Garter king of Arms, was collecting evidence on the descent of a Francis Percy, and he interviewed elderly people at Alnwick and noted register evidence in a manuscript. He states: "From the Register Book of Anwick, it appeareth that Elizabeth, daughter of Thomas Percy of Anwick Castle, was buried February 2nd, 1602, which was the year preceding the Powder Plot." (Possibly 1602/1603 but the Alnwick registers appear to be lost before 1645). Also "Oct. 14, 1680.— Matthew Scott of Gateshead in the Bishoprick of Durham, aged 99 years, certifieth that he knew Thomas Percy, who was afterwards in the Powder Plot, Constable of Anwick Castle, and that he had a son called Robert and two daughters, and that the said Robert was a schoolboy at Anwick". From A history of the house of Percy, by G Brenan, pages 359/360, quoting from original manuscript. https://archive.org/details/historyofhouseof02bren/page/359 There was one remaining daughter, name not known, who was living with her mother in London in 1605 and is said to have married the son of Robert Catesby, mentioned in the Wikipedia article linked.

Added their daughter Elizabeth she is my ninth great grandmother.