Historical Events
- Apr 4 Maurice, Elector of Saxony begins an alliance with Russian Anikey Stroganov
- Apr 10 Henri II of France occupies Metz
- Apr 18 Mauritius of Saksen occupies Linz
- Apr 19 Mauritius of Saksen captures Karel
Famous Birthdays
- Apr 15 Pietro Cataldi, Italian mathematician, born in Bologna, Papal States (now Italy) (d. 1626)