Question: Who is John De Vere, 13Th Earl Of Oxford's paternal grandmother?
Sentence (from "John de Vere, 13th Earl of Oxford"): John de Vere, 13th Earl of Oxford (8 September 1442 – 10 March 1513), the second son of John de Vere, 12th Earl of Oxford, and Elizabeth Howard, a first cousin of John Howard, 1st Duke of Norfolk - 2nd creation, was one of the principal Lancastrian commanders during the English Wars of the Roses.
Relevant evidence: Yes