Question: When did Thomas Grey, 1St Marquess Of Dorset's father die?
Sentence (from "John Grey of Groby"): Sir John Grey, of Groby, Leicestershire (c. 1432 – 17 February 1461) was a Lancastrian knight, the first husband of Elizabeth Woodville who later married King Edward IV of England, and great-great-grandfather of Lady Jane Grey.
Relevant evidence: Yes