Giovanni Francesco Sagredo

Giovanni Francesco Sagredo, born on 19 June 1571 and dead on 5 March 1620, was a Venetian mathematician and a close friend of Galileo, as well as a friend and correspondent of the English scientist William Gilbert. He was the fourth of six brothers born to Nicolò Sagredo, whose family traced its roots to the fifth century and lived in Palazzo Sagredo near the Venetian arsenal; his father was procurator of San Marco and reformer of the University of Padua. He did not marry. He is remembered today mainly because he appears as one of the figures in Galileo's controversial Dialogue Concerning the Two Chief World Systems of 1632.