Dietrich IV of Prussia (Chaos)

Dietrich IV of Prussia, Osterland and of the Wettin dynasty was born in 1589 as the son of Dietrich III and his wife.
In 1640, he joined the Baltic League that was founded by king Erik XVII of Sweden at this year. Otherwise, his government wasn't remarkable.
He died 1643 and was succeeded by his distant relative from the line of Balthasar (a Wettin sideline started in the 15th century!).