User blog comment:Blackfog05/Poseidon, Uranus and Pluton Relation/@comment-119.237.138.116-20121118072004

the D in luffy's name stands for descendants. Descendants of the ancient kingdom. In the void century, there was a war between the ancient kingdom and the other 20 kingdoms united, resulting in a loss of the ancient kingdom. The 20 kingdoms formed the world government and got rid of the traces of the ancient kingdom and banned all studies regarding it. One piece will probably be the kingdom. Maybe with all the descendants of the kingdom still secretly living there. Luffy will be the leader and will declare war on the world government. Or there will be one of the weapons such as uranus hidden there, and with it Luffy will gain termendous power, able to take on the world government, resulting in a final war ending the series.