To most, I will be remembered as a early Greek philosopher in the Cyrenaic school of moral philosophy.
To myself, I was a Greek mathematician of the 5th century BC...even written about by my tutee, Plato.
My student Theaetetus claims I was the first to pose the theorem that the square roots of the non-square numbers up to 17 are irrational...though the world has lost my proof.
My eponymic Spiral starts with an isosceles right triangle with hypotenuse length equal to √2, which becomes the foundation for a sequence of contiguous right triangles with hypotenuse lengths equal √3, √4, …, √17...if you add more triangles, they begin to overlap.
Theodorus of Cyrene (5th Century BC)