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Poland-Lithuania, formally known as the Polish-Lithuanian Commonwealth, was a dual state of the Polish Kingdom and the Grand Duchy of Lithuania, existing from the late 15th century until the late 18th century. Augustus, also known as Frederick Augustus I, served as both Elector of Saxony from 1694 to 1733 and King of Poland from 1697 to 1706 and again from 1709 to 1733.