Question: What is the date of death of Henry Richard Graves's father?
Sentence (from "Thomas Graves, 2nd Baron Graves"): He was instead elected to the House of Commons for Okehampton in 1812, a seat he held until 1818, and then represented Windsor from 1819 to 1820 and Milborne Port from 1820 to 1827, when he retired from the Commons to become one of His Majesty's Commissioners of Revenue of Excise.
Relevant evidence: No