Two years later, he received a dowry of 15,000 talers secured for the town of Wąsosz on occasion of his marriage with Anna Maria of Anhalt.

Joachim Frederick, together with his younger brother John George took the government of Oława (where they settled his residence) and Wołów but not in Brzeg, who was given by the late Duke to his widow Barbara of Brandenburg as dower.

However, two events changed this situation: on 24 October 1594 Anna remarried with Duke Frederick IV of Legnica (and in consequence lost her dower lands), followed two months later by the death of Barbara, on 2 January 1595.

Since 1585 he held the dignity of Lutheran Provost of the Chapter of Magdeburg, and in 1588 was appointed the General Commander of the Regular Army of Silesia.

Since both are minors at that time, the regency was exercised, firstly by their mother Anna Maria, and after her death in 1605, by their uncle Charles II of Poděbrady, Duke of Ziębice-Oleśnica.