Many biographies of the Buddha begin not with his birth in his last lifetime but in a lifetime millions of years before, when he first made the vow to become a buddha. According to a well-known version, many aeons ago there lived a Brahman named (in some accounts) Sumedha, who realized that life is characterized by suffering and then set out to find a state beyond death. He retired to the mountains, where he became a hermit, practiced meditation, and gained yogic powers. While flying through the air one day, he noticed a great crowd around a teacher, whom Sumedha learned was the buddha Dipamkara. When he heard the word buddha he was overcome with joy. Upon Dipamkara’s approach, Sumedha loosened his yogin’s matted locks and laid himself down to make a passage across the mud for the Buddha. Sumedha reflected that were he to practice the teachings of Dipamkara he could free himself from future rebirth in that very lifetime. But he concluded that it would be better to delay his liberation in order to traverse the longer path to buddhahood; as a buddha he could lead others across the ocean of suffering to the farther shore. Dipamkara paused before Sumedha and predicted that many aeons hence this yogin with matted locks would become a buddha. He also prophesied Sumedha’s name in his last lifetime (Gautama) and the names of his parents and chief disciples and described the tree under which the future Buddha would sit on the night of his enlightenment.