Why and how did Prince Siddhartha Gautama become the Buddha?

Gautama Buddha began life as a Prince named Siddhartha Gautama. At twelve he was sent away for schooling in the Hindu sacred scriptures. Four years later he was married. One day he went out for hunting. There he saw a sick man, an aged man, a general processioned and finally a monk begging for alms. These rights moved him so much that he at once decided to seek enlightens about the sorrows he had witnessed. He wandered for seven years and finally sat down under a peepal tree. He got enlightened after seven days and become the Buddha.