Deaths on May 27

Gaspard Dughet, Italian-French painter (b. 1613)

Gaspard Dughet (15 June 1615 – 25 May 1675), also known as Gaspard Poussin, was a French painter born in Rome.

4 May

Royal Greenwich Observatory
King Charles II of England orders the construction of the Royal Greenwich Observatory.
11 Aug

Battle of Konzer Brücke
Franco-Dutch War: Forces of the Holy Roman Empire defeat the French in the Battle of Konzer Brücke.
2 Nov

King Philip's War
Plymouth Colony governor Josiah Winslow leads a colonial militia against the Narragansett during King Philip's War.
11 Nov

Integral calculus
Gottfried Leibniz demonstrates integral calculus for the first time to find the area under the graph of y = ƒ(x).