Question: When was Bettina Von Arnim's husband born?
Sentence (from "Achim von Arnim"): Carl Joachim Friedrich Ludwig von Arnim (26 January 1781 – 21 January 1831), better known as Achim von Arnim, was a German poet, novelist, and together with Clemens Brentano and Joseph von Eichendorff, a leading figure of German Romanticism.
Relevant evidence: Yes