Question: What is the date of death of Margaret Cavendish, Duchess Of Newcastle-Upon-Tyne's husband?
Sentence (from "William Cavendish, 1st Duke of Newcastle"): William Cavendish, 1st Duke of Newcastle upon Tyne KG KB PC (6 December 1592 – 25 December 1676) was an English polymath and aristocrat, having been a poet, equestrian, playwright, swordsman, politician, architect, diplomat and soldier.
Relevant evidence: Yes