 At his death his art collection contained more than six hundred paintings, and his support of the young Caravaggio has given provenance to several of that artist's early works.Together with his brother, he helped Galileo win a lectureship in mathematics in Pisa in 1589 and in Padua in 1592.In the wake of Galileo’s discovery of the 'Medicean Planets', he gave the Cardinal a copy of his "Sidereus Nuncius" (Sidereal message) and a telescope as gifts (in 1610).