Question: When is Duchess Caroline Mariane Of Mecklenburg's husband's birthday?
Sentence (from "John Albert I, Duke of Mecklenburg"): John Albert I, Duke of Mecklenburg, in older literature known as" John" or" Johann"( 23 December 1525 – 12 February 1576), was the reigning Duke of Mecklenburg- Güstrow from 1547 to 1556 and of Mecklenburg- Schwerin from 1556 to 1576.
Relevant evidence: No