Question: What is the date of death of Dorothea Maria Of Anhalt's father?
Answer: 6 December 1586

Dorothea Maria was the sixth daughter of Joachim Ernest, Prince of Anhalt, but second-born daughter by his second wife Eleonore, daughter of Christoph, Duke of Württemberg. Joachim Ernest of Anhalt (21 October 1536 – 6 December 1586), was a German prince of the House of Ascania, ruler of the principality of Anhalt-Zerbst from 1551, and from 1570 sole ruler of all the Anhalt lands.