|My comrades! We'll overthrow Marley and restore the pride of Eldia!|
|— Grisha Jaeger rallying up the Restorationists|
The Restorationists (エルディア復権派 Erudia Fukken-ha?, lit. "Eldian Restorationists") 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They received weapons, funds, and historical documents from "the Owl," an informant from the Marley government.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 Marley Public Security and executed for treason against Marley.
Grisha Jaeger joined the Restorationists 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. Grisha devoted himself to taking down Marley and reviving Eldia. As he was interpreting an ancient scroll sent by the Owl, he met Dina Fritz, a woman of royal blood whose ancestors decided not to move to Paradis Island. The two married and had a son, Zeke Jaeger. Grisha was sure Zeke 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 reported his parents to the authorities to protect himself and his grandparents, and the 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 Pure 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.
- Despite "Eldia" (エルディア Erudia?) being spoken before "Restorationists" in Episode 57, the official English subtitles ignore it and translate the name of the organization as just the "Restorationists."