The Legend of the Ten-tailed Ookami
Long ago, when the earth was young, there were ten tailed beasts that roamed the Earth, the Shukaku, Nekomata, Isonade, Sokou, Houkou, Raijuu, Kaku, Yamata no Orochi, Kyuubi no Youko, and the Jyu Te-ru Tenma Ookami. They lived in a kingdom that was ruled by a cruel emperor. He was always trying to seize the power of all the tailed beasts for himself, but every time he tried to capture a beast, he was defeated by the Ookami, the strongest and wisest of the beasts. The years rolled by and eventually the cruel emperor died, leaving his son to capture them. The emperor's son was very cunning and smart. After his first three defeats he realized that where ever he attacked a beast, the Ookami would always come and stop him before he could get close enough to cast his nets. So, in order to capture the beast, he realized that he had to lure away the great wolf. The Ookami, he knew, had a soft spot for young pretty women. While the son was pondering ways to lure away the wolf, he came up with a plan. On the night of the new moon he sent his best hunters, disguised as traveling geisha, out in to the forest where the tailed beasts dwelled. They called out to the beast 'help us! We're lost!' they shouted.
The Ookami heard the cries of the hunters and went to investigate.' What's wrong?' he asked, not realizing they weren't women, it was too dark to see anything clearly. 'We dropped our lanterns and can't find our way home.' The strongest of the hunters replied,' Can you lead us back to our village?' he asked. 'Of course,' the Ookami said, coming closer to the group,' you all can ride on my back.' He said, kneeling down to allow them to climb on.
'NOW!' someone shouted, as many chakra enforced nets were cast. The Ookami couldn't fight them off as they drug him to the palace. He was locked away deep, under the palace, unable to see, or sense if his friends were alright. He sat and waited, building up chakra and anger for many years as he waited for the right time to escape. While he was imprisoned, one by one the beasts were starting to fall victim to the cruel emperor's son. Shukaku was taken to a desert in the Land of Wind, Nekomata was taken to a cold mountain top, Isonade was taken to a rainforest, Sokou was taken to a swamp on the outskirts of the continent, Houkou was taken to a cavern in an abandoned quarry, Raijuu was taken to an island in the middle of the ocean, Kaku was taken deep underneath a mountain, Yamata no Orochi was taken to the snow plains in the far north, and Kyuubi no Youko was trapped deep within a dense forest. After five hundred years of imprisonment, all of them started to wreak havoc on the people who live in the regions. Killing livestock and destroying villages. So it was decided that the nine tailed beasts would be sealed within nine Jinchuriki children. Meanwhile the Ookami was still trapped under the now abandoned palace, waited until he knew he had enough power to break the seals. When he was free he was weak and tired. He searched for many years to find his fellow tailed beasts, and still is. You can still hear his cries to them on a moonless night.