sentences:  A second Inner Austrian cadet branch of the Habsburgs ruled over Styria from 1564.Under Archduke Charles II of Inner Austria, Graz became a centre of the Counter-Reformation, expedited by the Jesuits at the University of Graz established in 1585 and continued under Charles' son Archduke Ferdinand II, who became sole rule of all Habsburg hereditary lands and Holy Roman Emperor in 1619.The Protestant population was expelled, including the astronomer Johannes Kepler in 1600.