Historic Publication
Feb 22 Galileo's "Dialogue Concerning the Two Chief World Systems" is published
Galileo Galilei
- Mar 29 Treaty of Saint-Germain is signed, returns Quebec to French control after the English seized it in 1629
- Apr 15 Battle of Rain; Swedes under Gustavus Adolphus defeat Count Tilly of the Holy Roman Empire during the Thirty Years' War.
Event of Interest
Apr 16 Albrecht von Wallenstein appointed supreme military commander of the Holy Roman Empire
Albrecht von Wallenstein
- May 25 Albrecht von Wallenstein recaptures Prague on Saksen
Victory in Battle
Jun 4 Prince Frederick Henry, Prince of Orange conquers Venlo
Frederick Henry
- Jun 5 Prince Frederick Henry, Prince of Orange conquers Roermond
- Jun 8 Frederick Henry, Prince of Orange, conquers Sittard
- Jun 20 Britain grants 2nd Lord Baltimore rights to Chesapeake Bay area
- Jul 22 Foundation laid in Madrid for Buen Retiro Palace for King Philip IV
- Jul 23 Three hundred colonists bound for New France depart from Dieppe, France
- Aug 22 Prince Frederick Henry, Prince of Orange occupies Maastricht
- Aug 28 Henry Casimir I appointed viceroy of Drenthe
Battle of Interest
Sep 1 Battle at Castelnaudary: Henri de Montmorency's rebel army loses to French royalist forces loyal to Louis XIII
Louis XIII
- Sep 3 Battle of Nuremberg: Duke Wallenstein beats Sweden
- Oct 5 Henry Casimir I appointed viceroy of Groningen
- Nov 16 Battle of Lützen: Significant battle of Thirty Years' War - Swedish and Saxon forces defeat the Holy Roman Empire, at cost of the death of Swedish King Gustavus Adolphus