- Sep 2 Robert Devereux's Parliamentarian infantry surrenders to Royalist forces in Battle of Lostwithiel, Cornwall, during English Civil War
Conquest of Sas of Gen
Sep 5 Frederick Henry, Prince of Orange conquers Sas van Gent and absorbs it into the Dutch Republic
Pope Innocent X
Sep 15 Giambattista Pamfili replaces Pope Urban VIII as Innocent X
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