Noah cursed his son Ham to live as the lowliest servant to his other two sons (Genesis 9:24-5). To escape the consequences of his grandfather’s curse, Nimrod energetically sought enough power to be instead a curse to others. He was the first on Earth to become a mighty warrior (Genesis 10:8).
Even more interestingly, he was a mighty conqueror before Yahweh (v. 9a). This means that Yahweh was aware of all that he did. It also means that Nimrod knew that his lust for power violated his relationship with Yahweh yet arrogantly dared Yahweh to make his curse effective.