Joachim FriedrichJoachim Friedrich Hohenzollern
) succeeded his father Johann Georg
as margrave of Brandenburg
in 1598, and was in turn succeeded at his death by his son Johann Sigismund
.He was duke of Prussia on account of his grandfather Joachim II
Hector and his father Johann Georg having been co-inheritors of the Dukedom of Prussia
Joachim Friedrich's sister was Sophie, who married Christian Wettin, Duke of Saxony. From that line came the later Frederick August I (the Strong) Duke of Saxony and King of Poland .
Joachim Friedrich's second marriage, in 1603, (apparently his first marriage was unimportant) was to Eleonore Hohenzollern, born 1583, daughter of Albert Frederick, Duke of Prussia.