Deaths on May 27

François Ravaillac, French assassin of Henry IV of France (b. 1578)

François Ravaillac (French: [fʁɑ̃swa ʁavajak]; 1578 – 27 May 1610) was a French Catholic zealot who assassinated King Henry IV of France in 1610.

7 Jan

Galilean moons
Galileo Galilei makes his first observation of the four Galilean moons: Ganymede, Callisto, Io and Europa, although he is not able to distinguish the last two until the following day.
2 Aug

Northwest Passage
During Henry Hudson's search for the Northwest Passage, he sails into what is now known as Hudson Bay.
9 Aug

Colony of Virginia
The First Anglo-Powhatan War begins in colonial Virginia.