Johann was the son of
John Albert I, Duke of Mecklenburg-Güstrow and Schwerin (1525–1576), and his wife Duchess
Anna Sophia of Prussia (1527–1591). He was eighteen years old when his father died. A
regency council was appointed that ruled in his name for the next nine years. The regency handed over the actual rule of his territories to him in 1585. He immediately faced problems he was ill-equipped to deal with, including massive debt and his uncle
Christopher's demands for territorial concessions. After an especially harsh argument with his uncle, he committed
suicide. Since suicides could not be buried in hallowed ground, a story was concocted which alleged that Johann had been killed by the devil as part of a pact with two women from
Schwerin. The women were questioned: Katharina Wankelmuth, who died from the effects of torture, and Magdalena Rukitz, who was burned at the stake. Their condemnation as witches cleared the way for Johann's burial in
Schwerin Cathedral. ==Marriage and children==