Great Titan War

The Great Titan War (巨人大戦) was a conflict between the people of Marley and the nation of Eldia, ending with the fall of the Eldian Empire and the creation of the Walls.

Prelude
For many hundreds of years, the various familial houses subservient to the Fritz family were in constant conflict between each other for control over the eight Titans, though the power of the Founding Titan maintained order in the Eldian Empire throughout the centuries. However, when the Founding Titan was inherited by Karl Fritz, the 145th King of the Fritz monarchy, he chose instead to abandon the conflict of Eldia and relocate the capital to the island of Paradis to the east of the mainland. In the King's absence, the people of Marley, descendants of an ancient nation defeated by Eldia, seized the opportunity and began civil war.

The War
With their numbers, the people of Marley were able to instigate a civil war, the Great Titan War, in Eldia. At this time, Marley succeeded in gaining the powers of seven out of the Nine Titans which held dominance in Eldia, dramatically turning the tide of the war in their favor. The first of these Titans to support the Marleyan uprising was the War Hammer Titan, held by the Eldian Tybur family. It is unknown for how long the Great Titan War was waged, but during the conflict Marley succeeded in claiming nearly all the territory that had previously belonged to the Eldian Empire. In the year 743, when Eldia was left with only the island of Paradis as their last undisputed territory, King Fritz chose to make use of the Founding Titan to put an end to the war and bring about lasting peace for Eldia. After gathering the people of Eldia, including non–Subjects of Ymir, to the island of Paradis, King Fritz used the Founding Titan to guide countless Colossus Titans in the construction of three concentric Walls around Eldia's remaining territory: Maria, Rose, and Sheena. In order to cease Marley's advance, King Fritz sent an official ultimatum stating that if they dared to make any hostile move against the people of the Walls, the Colossus Titans within would be unleashed upon the world to "flatten the entire earth". When all of Eldia had gathered within the Walls, the gates were sealed and King Fritz sent a message to the Fritz family who remained in Marley, stating that he had made a vow with the Founding Titan renouncing all war. With this vow, the Great Titan War came to a close.

Aftermath
After the closing of the gates in the Walls, King Fritz used the power of the Founding Titan to erase the memories of the world before the raising of the Walls from the minds of the Subjects of Ymir. For the next century, the Subjects of Ymir would live on believing themselves to be the last remnants of humanity on earth, with the world beyond the Walls overrun by the Titans, who they now believed had appeared without warning in the year the Walls were raised.

Across the sea on the mainland of the newly reformed nation of Marley, the people of Eldia who were left behind on the continent became low-class citizens under the authority of their new rulers. Rather than exterminating the Eldians, the government of Marley chose instead to confine them within the internment zones, such as in Liberio, separate from the Marleyan populace. The Tybur family was the only Eldian house that was allowed to keep their Titan because they were the first to go against King Fritz. They were also granted positions of high nobility as honorary Marleyans and were permitted to live on luxurious estates. Some remnants of the Fritz family also remained in Marley, displeased with King Fritz's decision to abandon the conflict of Eldia. Over the next eighty years, some Eldians would come together to form a restorationist movement with the goal of overthrowing Marley and restoring the empire of Eldia.

In the years after the Great Titan War, the Marley government would slander the old Eldian Empire with the claim that they had resorted to eugenics and ethnic cleansing in the 1,700 years before the Great Titan War, when such a catastrophic event had in reality never happened.

One hundred and seven years after the end of the Great Titan War, the Survey Corps discovers the basement of Grisha Yeager, an Eldian of the Marley internment zones who came to live within the Walls, and in Grisha's journals they learn the true history of the age before the raising of the Walls, as well as Grisha's past before his arrival at Paradis.

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