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Joachim I Nestor (born Feb. 24, 1484—died July 11, 1535, Kölln an der Spree, Brandenburg) was the elector of Brandenburg, an opponent of the Habsburg emperors, yet a devout Roman Catholic who prevented the spread of Protestantism in his lands during his lifetime. Joachim at first supported Francis I of France at the imperial election of 1519 and at one point even hoped to attain the title himself, but he finally backed Charles I of...