Gian Maria Visconti, Duke of Milan*1561 - Jan Tarnowski, Polish noble and statesman (b. 1488)
Gian Maria Visconti (or Giovanni Maria; 7 September 1388 – 16 May 1412) was the second Visconti Duke of Milan, the son of Gian Galeazzo Visconti and Caterina Visconti.