How do you know the sumerian government was both a monarchy and a theocracy

Because their rulers were kings, but at the same time, they believed that their governors came from the gods.

Explanation:

Because Sumerian was one of the first civilizations, they defined several political aspects that we regard today. Their government was a mixture of polices practices and religious beliefs. Because of that, the ruler had enormous power, it was one of the first conceptions of Absolutism in History.