Buddhism was set up by Siddhartha Gautama who was the first Buddha or Buddha Shakyamuni. According to Geshe Kelsang Gyatso, Buddha usually means, Awakened One and Shakya is the name of the Royals into which he was born while Muni means Able One. Here is an intro to the early life of Shakyamuni Buddha and an account of how Siddhartha Gautama became the Buddha.