Georg Mohr
Danish mathematician
Jørgen Mohr was a Danish mathematician, known for being the first to prove the Mohr–Mascheroni theorem, which states that any geometric construction which can be done with compass and straightedge can also be done with compasses alone. Wikipedia
Born: April 1, 1640, Copenhagen, Denmark
Died: January 26, 1697 (age 56 years), Sławnikowice, Poland