Born in April 17th 1707 Leonhard loved math
He lived in the kindom of Russia which is in Switzerland!
He introduced a trigonometric function with a writing system
He also took music and tried to make into math
He had two numbers named after him! E=2.71828 Eulers constant=0.57721
Leonhared died on September 18 1783 he died because of a brain hemarage which is when the brain bursts!