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treaties of Altranstädt, agreements made during the Second, or Great, Northern War (1700–21) by the Swedish king Charles XII with Augustus II, king of Poland and elector of Saxony (Sept. 24, 1706), and with the Holy Roman emperor Joseph I (Sept. 1, 1707). Shortly after Augustus was crowned king of Poland (Sept. 15, 1697), he formed an alliance with Denmark and Russia against Sweden (autumn 1699) that precipitated the Second Northern War. Charles, however, swiftly...