Augustus had no expectation of inheriting the electorate, since his older brother, Johann Georg IV, assumed the post after the death of their father on 12 September 1691. Augustus was well educated, and spent some years in travel and in fighting against France. Augustus married Kristiane Eberhardine of Brandenburg-Bayreuth in Bayreuth on 20 January 1693. They had a son, Frederick Augustus II (1696–1763), who succeeded his father as Elector of Saxony and King of Poland as Augustus III. While in Venice during the carnival season, his older brother, the Elector Johann Georg IV, contracted smallpox from his mistress Magdalena Sibylla of Neidschutz. On 27 April 1694, Johann Georg died without legitimate issue and Augustus became Elector of Saxony, as Friedrich Augustus I. Conversion to Catholicism To be eligible for election to the throne of the Polish–Lithuanian Commonwealth in 1697, Augustus had to convert to Roman Catholicism. The Saxon dukes had traditionally been called "champions of the Reformation". Saxony had been a stronghold of German Protestantism and Augustus' conversion was therefore considered shocking in Protestant Europe. Although the prince-elector guaranteed Saxony's religious status quo, Augustus' conversion alienated many of his Protestant subjects. As a result of the enormous expenditure of money used to bribe the Polish nobility and clergy, Augustus' contemporaries derisively referred to the Saxon duke's royal ambitions as his "Polish adventure". His church policy within the Holy Roman Empire followed orthodox Lutheranism and ran counter to his new-found religious and absolutist convictions. The Protestant princes of the empire and the two remaining Protestant electors (of Hanover and Prussia) were anxious to keep Saxony well-integrated in their camp. According to the Peace of Augsburg, Augustus theoretically had the right to re-introduce Roman Catholicism (see Cuius regio, eius religio), or at least grant full religious freedom to his fellow Catholics in Saxony, but this never happened. Saxony remained Lutheran and the few Roman Catholics residing in Saxony lacked any political or civil rights. In 1717, it became clear just how awkward the situation was: to realize his ambitious dynastic plans in Poland and Germany, it was necessary for Augustus' heirs to become Roman Catholic. After five years as a convert, his son—the future Augustus III—publicly avowed his Roman Catholicism. The Saxon Estates were outraged and revolted as it became clear that his conversion to Catholicism was not only a matter of form, but of substance as well. Since the Peace of