Question: Who is John Beaufort, Marquess Of Dorset's maternal grandfather?
Sentence (from "Eleanor Beauchamp, Duchess of Somerset"): Lady Eleanor Beauchamp, Baroness de Ros and Duchess of Somerset (September 1408 – 6 March 1467) at Wedgenock, Warwickshire, England, was the second daughter of Richard de Beauchamp, 13th Earl of Warwick and Elizabeth de Berkeley, daughter of Thomas de Berkeley, 5th Baron Berkeley.
Relevant evidence: Yes