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The Landgraviate of Hesse-Darmstadt came into existence in 1567, when George, youngest of the four sons of Landgrave Philip I "the Magnanimous", received the Hessian lands in the former upper County of Katzenelnbogen. His eldest brother William IV received the Landgraviate of Hesse-Kassel, while the second son Louis IV obtained Hesse-Marburg, and the third Philipp II became Landgrave of Hesse-Rheinfels.