Both King of Poland and Elector of Saxony, Augustus is one of the great what-ifs of the 18th century. He could have turned the accident of ruling two major realms into the basis for a powerful European state - a bulwark against the Russians and a block on Prussian expansion. Alas, there was no opportunity Augustus did not waste and no decision he did not get wrong. By the time of his death Poland was fatally damaged and would subsequently disappear as an independent state until the 20th century. This is Tim Blanning's study in failed statecraft, showing how a ruler can shape history as much by incompetence as brilliance.