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King Fritz
King Fritz was the ruler of Eldia, a nation of people who could turn into Titans. He was a cruel and oppressive ruler, and he forced his people to fight in a war against Marley, another nation of people. After Eldia was defeated in the war, King Fritz decided to use the power of the Titans to create a new world where Eldians would be safe from harm. He used the Founding Titan to create the Walls of Maria, which protected Eldia from the rest of the world. He also wiped the memories of all Eldians, so that they would forget about their past and live in peace. King Fritz's actions were controversial, but they ultimately led to the creation of the world that we see in Attack on Titan.