Shaka no Shougai (Series)

After a portentous dream about a white elephant, the ancient Hindu princess Maya gives birth to a prince. Reared in seclusion from the troubles of the world, Prince Siddhartha is troubled by sights of poverty and deprivation when he is 12 years old. He is married to a beautiful wife, but he is unable to bear the thought of others suffering, and leaves the palace in search of an answer. While sitting underneath a tree, he achieves enlightenment. (Source: The Anime Encyclopedia)