Question: What is the date of death of Dorothy Spencer, Countess Of Sunderland's father?
Sentence (from "Dorothy Spencer, Countess of Sunderland"): Dorothy Spencer ("née" Sidney; later Smythe), Countess of Sunderland (5 October 1617 (baptised) – 5 February 1684), was the wife of Henry Spencer, 1st Earl of Sunderland, and the daughter of Robert Sidney, 2nd Earl of Leicester, and Lady Dorothy Percy.
Relevant evidence: Yes