|My brothers! Let us overthrow Marley!! Let us correct the errors of history!! And let us regain our pride as Eldians!! My brothers!! We will fight until the day Eldia returns!!|
|— Grisha Yeager rallying up the Restorationists|
The Eldian Restorationists (エルディア復権派 Erudia Fukken-ha?) were a radical group of Eldians in Liberio who plotted to destroy Marley using the Founding Titan, and restore Eldia as a world power. They rejected Marley's teachings and believed them to be lies. The symbol of the group was a cross-shaped scar on each member's body, which they make themselves with a knife.
They received weapons, funds, and historical documents from "the Owl," an informant from the Marley government. The documents were written in an unreadable language, but looking at illustrations, they concluded that Ymir Fritz had used the power of the Titans to cultivate lands, build roads, and bring wealth to mankind.
The remnants of the royal family that stayed in Marley formed a revolutionary army; however, this army was unsuccessful and was crushed. All members of this original organization, including Eren Kruger's father, were smoked out by Public Security Authorities and executed for treason against Marley.
Grisha Yeager joined a similar anti-establishment group, organized by Kruger, at the age of 18 when a member of the organization came to his clinic and told him that they received information that his sister had been killed by a man in the Marley authorities. In this organization, run under the cover of being a social dancing club, Grisha devoted himself to interpreting ancient text and planning to revive Eldia. There, he also met his wife, Dina Fritz, a woman of royal blood whose ancestors decided not to move to Paradis Island. She would later give birth to their son Zeke Yeager. Grisha was sure he would lead them to victory over Marley. When the Warrior program of the Marley government was proclaimed, he planned to make Zeke a Warrior who was then supposed to turn against Marley. However, at the age of 7, Zeke discovered that the Marleyan authorities were close to discovering the group. To protect himself and his grandparents, he reported his parents to the authorities and the Eldian Restorationists were arrested. They were then sentenced to be sent to Paradis Island, where they would roam as pure Titans as they feed on other Eldians.
Before being sent to Paradis Island, Grisha was tortured by the authorities for information such as the Restorationists plans, and the identity of "The Owl." After this, the organization members were shipped to Paradis Island in preparation of their execution. All members of the group were transformed into mindless Titans, except Grice and Grisha. The former, who was simply kicked off the wall to be eaten by the Titans, and the latter, who was kept alive by Kruger for further questioning. Once most of the public service authorities had returned to their ship, Kruger saved Grisha from execution by killing Gross. He then revealed himself as "The Owl," transformed into a Titan, and begun slaughtering the other authorities.
After returning to Grisha from his massacre, Kruger explained his reasoning for saving Grisha and gave him a mission to restore Eldia's freedom and dignity by entering the Walls to retake the Founding Titan. He explained that Grisha would do this by using the Titan powers he would give to him. At first, Kruger was met with resistance from a burnt out Grisha, but after giving him a picture of his family and convincing him further, Grisha's will was reignited and he accepted Kruger's mission.
Kiyomi Azumabito reports to the Eldian military that Zeke Yeager had met with her in secret, describing himself as a true Eldian Restorationist for as long as he can remember. He regrets having to kill Eldians and devastate Paradis, though he explains that going along with Marley's plan was his best chance of uniting the Founding Titan with a Titan of royal blood. Despite allegedly holding his parents' ideology, he remarks that they were naive and would never have been able to restore glory to the Eldian Empire. Promising Kiyomi that Hizuru and the Azumabito family will have access to the resources beneath Paradis Island, Zeke gains Kiyomi's support in his long term plan to restore Eldia: by modernizing the island with Hizuru's aid, and by keeping the option of "the rumbling" available.
In truth, Zeke's goals ran directly contrary to the Eldian Restorationists, looking to "euthanize" Eldia by using the powers of the Founding Titan to prevent Subjects of Ymir from bearing children.