Question: When did Prince Henry, Duke Of Cumberland And Strathearn's mother die?
Sentence (from "Prince Henry, Duke of Cumberland and Strathearn"): (Henry Frederick; 7 November 1745 – 18 September 1790) was the sixth child and fourth son of Frederick, Prince of Wales, and Princess Augusta of Saxe-Gotha, and a younger brother of George III.
Relevant evidence: Yes