Question: What is the date of death of Maria, Lady Walpole's husband?
Sentence (from "Robert Walpole"): Robert Walpole, 1st Earl of Orford, (26 August 1676 – 18 March 1745), known between 1725 and 1742 as Sir Robert Walpole, was a British politician who is generally regarded as the "de facto" first Prime Minister of Great Britain.
Relevant evidence: Yes