Question: When did Ferdinand Karl, Archduke Of Austria-Este's mother die?
Sentence (from "Ferdinand Karl, Archduke of Austria-Este"): Archduke Ferdinand Karl of Austria-Este (Ferdinand Karl Anton Joseph Johann Stanislaus; 1 June 1754 – 24 December 1806) was a son of Holy Roman Emperor Franz I and Maria Theresa of Austria.
Relevant evidence: Yes