An equal of da Vinci is in my opinion Leibniz. He made so many contributions to a wide array of disciplines - math, physics, biology, engineering, philosophy, politics, law, and many others. But for some reason, Leibniz is largely forgotten by history. One example, he developed calculus simultaneously with, but independent of, Newton. We even use the integral symbol invented by Leibniz in mathematical notation, yet full credit for developing calculus generally goes to Newton.