Eorl was born in 2485 in the second earth in the middle world of Tolkien. Eorl became the leader of the people of Eotheod when he was 16 years old. After 9 years, the Orcs attacked Gondor. And the king of Gondor asked for help from Eorl. In Eorl, he accepted this request and attacked the Orcs from behind. Thanks to Eorl, the Orcs was defeated. And the king of Gondor gave Eorl a great land as a gift. And this land was called Rohan. And Eorl became the first king of the Kingdom of Rohan. In 2545, the Easterlings attacked Rohan. The kingdom of Rohan won this war. But Eorl was injured in this war and died.
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From @manyasli