The correct answer is false.
It is false that Gilgamesh built the world's first empire after defeating Sumer and northern Mesopotamia.
We are talking about one of the most important heroes in the Sumerian tradition stories. He is the main character in the mythological story called the "Epic of Gilgamesh." It is said that Gilgamesh had unbelievable strength and courage to defeat his enemies and to overcome difficulties. He later became the king of the important city-state of Uruk, in ancient Sumeria.