In 1520 Henry's grandsons, Henry V and Albert VII, again divided the duchy, creating the subdivision of Mecklenburg-Güstrow, which Duke Adolf Frederick I of Mecklenburg-Schwerin inherited in 1610. In a second partition of 1621, he granted Güstrow to his brother, John Albert II. Both were deposed in 1628 by Albrecht von Wallenstein, as they had supported Christian IV of Denmark in the Thirty Years' War. Nevertheless, the Swedish Empire forced their restoration three years later. When John Albert II's son, Duke Gustav Adolph, died without male heirs in 1695, Mecklenburg was reunited once more under Frederick William.