Catholic Cleric and
Astronomer developed the Sun Centered Theory Of Our Universe.
Used simple wooden instruments and he was able to develop the theory and perform the calculations to prove it.
Published the finding in "De Revolutionibus Orbium Coelestium" in Latin, the principle language of the science in Europe of the time.
That is Why he is more commonly referred to as Nicolas Copernicus.
He was invited by the Pope to defend his work, but his Bishop ordered him to stay in Poland. Had he gone to Rome, he would likely been executed as a heretic.