Maximilian II, Holy Roman Emperor
Primate Jakub Uchanski summoned the Convocation Sejm to Warsaw on October 3, 1575. The date of royal election was set for November 7. Pro-French and pro-Habsburg faction, which consisted of most senators, Roman Catholic clergy (including Uchanski himself), Protestants, Prussian cities and Lithuanians supported Maximilian II, Holy Roman Emperor.