Joachim III Frederick, Elector of Brandenburg (1546–1608), Prince-elector of the Margraviate of Brandenburg
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His titles also included "duke (Dux) of Stettin, Pomerania, Cassubia, Vandalorum and Crossen", according to the terms of the Treaty of Grimnitz, although the Pomeranian titles were only nominal.
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.
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).