Question: Who is William Seymour, 3Rd Duke Of Somerset's paternal grandfather?
Sentence (from "Richard of Conisburgh, 3rd Earl of Cambridge"): Richard of Conisburgh, 3rd Earl of Cambridge( c. July 1385 – 5 August 1415) was the second son of Edmund of Langley, 1st Duke of York, and Isabella of Castile.
Relevant evidence: No