Question: Who is Thomas De Clare, Lord Of Thomond's paternal grandmother?
Sentence (from "Richard de Clare, 6th Earl of Gloucester"): Richard de Clare, 5th Earl of Hertford, 6th Earl of Gloucester, 2nd Lord of Glamorgan, 8th Lord of Clare (4 August 1222 – 14 July 1262) was son of Gilbert de Clare, 4th Earl of Hertford and Isabel Marshal.
Relevant evidence: Yes