Sonni dynasty in the context of Askia Mohammad I

The Songhai Empire was a state located in the western part of the Sahel during the 15th and 16th centuries. At its peak, it was one of the largest African empires in history. The state is known by its historiographical name, derived from its largest ethnic group and ruling elite, the Songhai people. Sonni Ali established Gao as the empire's capital, although a Songhai state had existed in and around Gao since the 11th century. Other important cities in the kingdom were Timbuktu and Djenné, where urban-centred trade flourished; they were conquered in 1468 and 1475, respectively. Initially, the Songhai Empire was ruled by the Sonni dynasty (c. 1464–1493), but it was later replaced by the Askia dynasty (1493–1591).

During the second half of the 13th century, Gao and the surrounding region had grown into an important trading center and attracted the interest of the expanding Mali Empire. Mali conquered Gao near the end of the 13th century. Gao remained under Malian command until the late 14th century. As the Mali Empire started disintegrating, the Songhai reasserted control of Gao. Songhai rulers subsequently took advantage of the weakened Mali Empire to expand Songhai rule.

The Askiya dynasty, also known as the Askia dynasty, ruled the Songhai Empire at the height of that state's power. It was founded in 1493 by Askia Mohammad I, a general of the Songhai Empire who usurped the Sonni dynasty. The Askiya ruled from Gao over the vast Songhai Empire until its defeat by a Moroccan invasion force in 1591. After the defeat, the dynasty moved south back to its homeland and created several smaller kingdoms in what is today Songhai in south-western Niger and further south in the Dendi.