Major Events
- Feb 22 Galileo Galilei's book "Dialogue Concerning the Two Chief World Systems" is published comparing the Copernican and Ptolemaic systems and whether the Earth orbits the sun
- 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.
- Apr 16 Albrecht von Wallenstein appointed supreme military commander of the Holy Roman Empire
- May 25 Albrecht von Wallenstein's Catholic League army recaptures Prague
- Jun 4 Frederick Henry, Prince of Orange conquers Venlo
- Jun 5 Frederick Henry, Prince of Orange conquers Roermond
- Jun 8 Frederick Henry, Prince of Orange, conquers Sittard in the Netherlands
- 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
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