I received a free education at the University of Erlangen, due to my father's fame as a lawyer catching King Maximilian Joseph attention enough to award all of my brothers a free university education as well.
After getting a doctorate at age 22 and a position teaching at the Gymnasium at Erlangen, my life fell apart (perhaps due to political enemies of my father, my rebellious nature as a youth, my joining a political organization, or my incurring debts)...one day as I walked to class, I was arrested.
While in prison waiting for my trial, I tried to commit suicide twice, the last time by jumping out a window, landing in a deep snow bank alive but permanently crippled.
As part of my recuperation, I studied mathematics....and my fame lies in my discovery of the ninepoint circle: It passes through the feet of the altitudes of a triangle, touches all four of the circles tangent to the three sides of the triangle, and it is internally tangent to the inscribed circle and externally tangent to each of the circles which touch the sides of the triangle externally.
My other mathematical discovery was the idea of homogeneous coordinates, found independently of Möbius.
Eventually I felt recovered mentally and returned to teach mathematics, but I did it too fast...as one historian wrote about me: "... one day he appeared in class with a drawn sword and threatened to cut off the head of every student in the class who could not solve the equations he had written on the blackboard. After this episode he was permanently retired. Gradually he withdrew more and more from reality. He allowed his hair, beard, and nails to grow long; he would stare at occasional visitors without any sign of emotion; and his conversation consisted only of low mumbled tones without meaning or expression."
I died as a recluse six years later, never thinking about geometry any more.
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Answer:
Karl Wilhelm von Feuerbach (1800  1834)
