Year (''' MDCLV ''') was a Common Year Starting On Friday (link will display the full calendar) of the Gregorian Calendar (or a Common Year Starting On Monday of the 10-day slower Julian Calendar ).
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- The Bibliotheca Thysiana is erected, the only surviving 17th century example in the Netherlands of a building that was designed as a library.
: ''See also .''
- January 5 - Pope Innocent X (b. 1574 )
- February 25 - Daniel Heinsius , Flemish scholar (b. 1580 )
- April 6 - David Blondel , French Protestant clergyman (b. 1591 )
- April 30 - Eustache Le Sueur , French painter (b. 1617 )
- June 27 - Eleonore Gonzaga , wife of Ferdinand II, Holy Roman Emperor (b. 1598 )
- July 15 - Girolamo Rainaldi , Italian architect (b. 1570 )
- July 28 - Cyrano De Bergerac , French soldier and writer (b. 1619 )
- August 10 - Alfonso De La Cueva, Marqués De Bedmar , Spanish cardinal and diplomat (b. 1572 )
- September 7 - François Tristan L'Hermite , French dramatist (b. 1601 )
- October 16 - Joseph Solomon Delmedigo , Italian physician, mathematician, and music theorist (b. 1591 )
- October 24 - Pierre Gassendi , French philosopher, mathematician, and scientist (b. 1592 )
: ''See also .''
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