Question: When did Ferdinand Karl, Archduke Of Austria-Este's mother die?
Sentence (from "Prince Joachim of Belgium, Archduke of Austria-Este"): Prince Joachim of Belgium, Archduke of Austria- Este(" Joachim Karl- Maria Nikolaus Isabelle Marcus d' Aviano"; born 9 December 1991), is the younger son and third child of Lorenz, Archduke of Austria- Este and Princess Astrid of Belgium.
Relevant evidence: No