There is a legend in this country that in ancient times, when the earth was overrun with monsters, a giant warrior came down from the Heaven, defeated the monsters, and brought peace to the earth. The people of the earth worshiped these long-limbed warriors as the Heaven Warriors. The Heaven Warriors who fought directly against the monsters on the earth were the Four Devas of Heaven, called Ryuo-ten, Hayabusa-ten, Kaen-ten, and Kouzan-ten. Those who inherited the powers of the Four Devas of Heaven were the Gundam Four Beast Kings, and those who inherited their armor were called the Four Devas of Furinkazan. the Four Devas of Heaven are the execution forces of the heavens, and there are Heaven Warriors who command them. These are the Three Heaven Generals. The God of War, Raitei, commands the Four Devas of Heaven. Jitei watches over peace on earth. And the one who rules the heavens and stands at the top of the Heaven Warriors is the Tentei. In the past, people built shrines to worship the Tentei, who was the pinnacle of the Heaven Warriors, and this country came to be called Ark.