This one might be a long one. In the Enies Lobby Arc, we see an orrery of some kind in Ohara, an island that used to be in the West Blue. That orrery depicts Earth having six moons which would explain the erratic weather in the Grand Line. It’s known that there used to be an ancient civilization on one of the moons and that civilization are the ancestors of the Skypieans, Birkans, and Shandorians. That moon civilization had very advanced technology and architecture, but they left due to the lack of resources and they went to Earth which took place over 1,000 years ago. I think that Imu, if he/she truly is immortal, and the old ancestors of the Celestial Dragons are from another moon which is why the current Celestial Dragons wear space suit like outfits (I’ll refer to them as Ancient Celestials for simplicity). I think that the Ancient Celestials went from moon to moon greedily taking what they can in terms of resources, power, etc. and when nothing was left on the moons, they finally went to Earth, but they arrived after the people of the Moon civilization who, by then, greatly befriended the tribes and people that were already there: Giants, Minks, Humans, Buccaneers, etc. and formed a very harmonious, advanced Kingdom. The Ancient Celestials who arrived during the height of that Kingdom were welcomed with great kindness, but they eventually grew envious of the Great Kingdom and coveted the resources, power, wealth, etc. that the Kingdom had gained. As the Great Kingdom continued to rise in power, the Ancient Celestials bided their time, becoming fierce fighters, warriors, and creating weapons. As they did that, they created Houses: Nerona, Nefertari, Donquixote, Jaygarcia, Topman, etc. and the heads of those Houses named themselves Kings. When the Ancient Celestials were ready, they waged war against the Great Kingdom. I think that the people of the Great Kingdom were complete pacifists who had never or at least very rarely knew war or violence. The advanced technology they had was used to harmonize with the land, the sea, the sky, the animals, and the people, all of which was freely shared amongst everyone and was not used for war, battle, or greed. I think they built the Ancient Weapons Uranus, Poseidon, and Pluton out of desperation. As the war was nearing an end, they created the Ponegliffs to tell their story and the Ancient Celestials won soon after and created the World Government. I think Imu created the Five Elder Star ranking system who would “rule” the World Government, naming the ranks after the moons which they came from; Ju Peter, Saturn, etc. What do you all think?