Joy boy was the pirate/sailor during the void century belonging to the lost ancient kingdom. He had around 12 crew-members and the crew name started with D. The ancient kingdom had advanced technology and was rich. It may also have the substance or technology to give eternal life. Some group of people (gorosei) were intrested in eternal life and to obtain that they proposed the 20 kingdoms the concept of world government and their life as Gods of the world. So the 20 kingdom revolted against the ancient kingdom and when they were about to loose they send Joy Boy and his crew to disperse the poneglyph around the world so that they could spread information about their existence.While on the journey Joy boy left the poneglyph that he cannot fulfill the promise but someday it will at fishmen Island. Also he dispersed his crew to pass on the will of the D. But one crew member betrayed Joy boy which lead to his demise. May be their ship was noha as in the tale of Noha where he build a ship to save every creature in the world similarly in one piece to save information through poneglyph.