Question: What is the date of death of Prince Friedrich Karl Of Prussia (1828–1885)'s mother?
Sentence (from "Prince Friedrich Karl of Prussia (1828–1885)"): Prince Friedrich Karl of Prussia (20 March 1828 – 15 June 1885) was the son of Prince Charles of Prussia (1801–1883) and his wife, Princess Marie of Saxe-Weimar-Eisenach (1808–1877).
Relevant evidence: Yes