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Joachim III Frederick, Elector of Brandenburg (1546–1608), Prince-elector of the Margraviate of Brandenburg
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Joachim Frederick of Brieg (1550–1602), Duke of Oława, Wołów, Brzeg, and Legnica
Sceptrum Brandenburgicum (or Sceptrum Brandenburgium – Latin for scepter of Brandenburg) was a constellation created in 1688 by Gottfried Kirch, astronomer of the Prussian Royal Society of Sciences.
Following King Sigismund III's Prussian regency contract (1605) with Joachim Frederick of Brandenburg and his Prussian enfeoffment contract (Treaty of Warsaw, 1611) with John Sigismund of Brandenburg these two rulers of Ducal Prussia guaranteed free practice of Catholic religion in prevailingly Lutheran Prussia.
Initially he served the Elector of Brandenburg, and later was at the court of the Elector Wilhelm von der Pfalz-Neuburg, (Palatinate) where he held the position of vice chancellor (Vicekanzler).