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The Sultanate of Agadez was a Berber kingdom centered first in the city of Agadez in the Aïr Mountains, located at the southern edge of the Sahara desert in north-central Niger. It was founded in 1405 by the Tuareg. The Agadez Sultanate was later conquered by the Songhai Empire in 1500. After the defeat of the Songhai kingdom in 1591, the Agadez Sultanate regained its independence. It experienced a steep decline in population and economic activity during the 17th century. The sultanate came under French suzerainty in 1906.