Ten kings ruled from one end of the world to the other. The first king was the Holy One, blessed be He, who rules in heaven and on earth, and it was His intention to raise up kings on earth, as it is said, "And he changeth the times and the seasons; he removeth kings, and setteth up kings" (Dan. 2:21).
The second king was Nimrod, who ruled from one end of the world to the other, for all the creatures were dwelling in one place and they were afraid of the waters of the flood, and Nimrod was king over them, as it is said, "And the beginning of his kingdom was Babel" (Gen. 10:10).