Gilgamesh is the world's most famous Sumerian leader because of his greatest accomplishment which was massive construction of city walls around Uruk.
In mythology, Gilgamesh was a King during the ancient Mesopotamian and a protagonist in the Epic of Gilgamesh.
His accomplishment as a King was mentioned in myths text, historical text, as poems etc.
In conclusion, Gilgamesh is the world's most famous Sumerian leader because of his greatest accomplishment which was massive construction of city walls around Uruk.
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