He had twice tried to commit suicide and was prone to violent outbursts and a great fear of " Turks and Muscovites " overrunning Germany.

Joachim Frederick would pass away in 1608 and his son John Sigismund then suceeded him both as duke and as regent for his mentally ill father in law; and Anna became the new duchess.

Her husband zealous in his new faith he set about removing paintings and altarpieces from the churches and supported other iconoclasts doing the same.

John Sigismund, was favorably inclined towards the Swedish king, but he was in very ill health after suffering apoplectic stroke in the autumn of 1617.

Anna initially showed a strong dislike for her daughters suitor,this had less to do with the young king himself and more with her looking after the interests of her family.

By her daughters potential marriage to the Polish kings old enemy , it might turn out that Sigismund would deny for her son to suceed.

On his return to Berlin, Anna seemed to have completely changed her thought about the match and was much warmer in her demeanour towards the young king.

[4] As the region had been a part of the Kingdom of Poland since the Second Peace of Thorn (1466), King Sigismund I the Old of Poland as its suzerain, granted the territory, the Duchy of Prussia, as an hereditary fief (a Polish fief) to Annas paternal grandfather Albert of Brandenburg-Ansbach, the first Duke of Prussia per the Treaty of Kraków, a decision that was sealed by the Prussian Homage in Kraków in April 1525.

In an effort to keep her son from preventing the marriage,on 7 October 1620, Anna Maria Eleonora, her youngest daughter Catherine left Brandenburg.

Leaving from Wismar ,a swedish ship took themn over to Kalmar, where Gustavus Adolphus was waiting to escort them.