Why did the Almoravids invade the Ghana Empire?

The Almoravids invaded Wagadu, the Ghana Empire, for two reasons that were impossible to separate: gold and God.

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Controlling the trans-Saharan trade routes was the economic prize, and spreading a stricter form of Islam was the religious justification, and neither motive can be read without the other.

Who the Almoravids were

The Almoravids were a Berber dynasty that emerged in the 11th century, based primarily in what is now Morocco. They were known for their militant Islamic reform movement and sought to spread their strict interpretation of Islam across North Africa and parts of West Africa. They were not a distant empire looking for adventure. They were immediate neighbors to the north, and they could see exactly how rich Wagadu had become from sitting at the crossroads of the gold and salt trade.

The trade motive

The growing power of the Almoravids led them to launch a war against the Ghana Empire under Abu-Bakr Ibn-Umar to gain control of the coveted Saharan trade routes. Wagadu's capital and its tributary city of Awdaghost were the southern terminals of that trade. Whoever held them collected the taxes. The Almoravids captured important trade cities such as Awdaghost, which weakened Ghana's military and economic power.

The religious justification

The war was justified as an act of conversion through military arms, what is called the lesser jihad. The Soninke ruling class of Wagadu had traded alongside Muslim Arab merchants for generations and had absorbed some Islamic practice, but they had not converted wholesale. Ghana's ruler Bassi had good relations with Muslims but refused to convert to Islam, which angered the Almoravids, who wanted to convert other peoples to their faith.

What the invasion actually did

The Almoravids fought the Ghana Empire for 5 years before reaching and laying siege to the capital city. Whether the Almoravids captured Kumbi Saleh outright, traditionally placed around 1076, is contested, but what is certain is that Almoravid presence in Ghana's territory and its control of Sijilmasa and Awdaghust in effect meant that it controlled Kumbi's trade relations and policies.

The aftermath was the real destruction. The flow of trans-Saharan trade originating from the inter-Niger-Senegal River region shifted away from the Ghana Empire, and the economic impact of this shift was ruinous for the political power of the Ghana state, which collapsed completely by the 13th century. Almoravid presence also encouraged provinces of the Ghana Empire to assert their own independence, which further weakened centralized power.

The debate historians still have

It is worth knowing that not everyone reads this as a clean military conquest. Scholars Conrad and Fisher argued that the notion of any Almoravid military conquest is merely perpetuated folklore derived from a misinterpretation of Arabic sources, and Professor Timothy Insoll noted that the archaeology of ancient Ghana does not show the signs of rapid change and destruction that would be associated with military conquests. A third view holds that the Almoravid religious influence was gradual rather than militarily decisive, and that the Almoravids increased in power partly by marrying among the empire's nobility.

The honest answer is that the invasion was probably both: a real military campaign that may not have been the total sack that older sources describe, combined with economic strangulation and gradual religious and political pressure that together broke a kingdom that was already straining under its own weight.

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This follows on from
Where did the Greek learn from? Where did the Romans learn from?

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