Why were the kings of Ghana known to Europeans as some of the richest of monarchs?

Question

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The kings of Ghana were known as some of the richest monarchs by Europeans because they controlled a vast trade network that dealt in many commodities. They were located at the intersection of the trans-Saharan trade routes and the west African coast, which allowed them to trade in gold, salt, ivory, and slaves. This made them very wealthy and powerful.

Why Were the Kings of Ghana Known to Europeans as Some