徐福
Many rulers of ancient China sought the fabled elixir to achieve eternal life. During the Qin Dynasty, Qin Shi Huang sent Taoist alchemist Xu Fu to the eastern seas with 500 young men and 500 young women to find the elixir in the legendary Penglai Mountain, but returned without finding it. He embarked on a second voyage with 3000 young girls and boys, but none of them ever returned (legend has it that he found Japan instead).