Also known as Sunni Ali, Sonni Ali Ber (The Great).

There are two main sources of information about Sonni Ali. One is in the Islamic chronicles of the period, the other is through Songhai oral tradition. These sources reflect two different interpretations of Sonni Ali's role in the development of the Songhai Empire.

Sonni Ali was schooled in the traditional African arts of the region and was well versed in the forms and techniques of warfare when he came to power in 1464 in the small kingdom of Songhai, which was centred around its capital city of Gao on the Niger River. He was the 15th consecutive ruler of the Sonni dynasty, which had begun in 1335. One of Ali's ancestors, Sonni Sulaiman Mar, is said to have wrested Songhai away from the Mali Empire towards the end of the 14th century.

Although Songhai had once paid tribute to the rulers of Mali, the Mali Empire was now crumbling, and the time was right for Sonni Ali to lead his kingdom through a series of conquests at the old empires expense. By 1468 Sonni Ali had repulsed attacks by the Mossi to the south, and defeated the Dogon in the hills of Bandiagara. His first major conquest occurred the in following year when the Muslim leaders of Timbuktu, one of the great cities of the Mali Empire, asked for help against the Tuareg, the nomadic desert Berbers who had occupied the city since 1433. Sonni Ali took the opportunity not only to strike decisively against the Tuareg, but also against the city itself. Timbuktu became part of the fledgling Songhai Empire in 1469.

Sonni Ali is remembered in Songhai oral tradition as a magician of great power. Rather than following the Mali Empire system of Islamic city rule over a non-Islamic rural people, Sonni Ali mixed an unorthodox observance of Islam with traditional African religion. He was a man of the people rather than the elite ruling class of Muslim clerics and scholars. He is regarded as a great military commander who carried out a strategic campaign of conquest along the Niger River. He is said to have retaliated against the Muslim leadership within Timbuktu after they failed to provide promised transport for his troops to cross the river.

The chroniclers have a different viewpoint - Sonni Ali is portrayed as a capricious and cruel leader. In the 16th century chronicle of Abd ar Rahmen as-Sadi, a historian based in Timbuktu, Sonni Ali is described as an impious and unscrupulous tyrant. He is recorded as having massacred hundreds whilst plundering the city of Timbuktu - killing or driving out the Tuareg and Sanhaja clerics who had acted as civil servants, teachers, and as preachers at the Sankore mosque. In later years he is said to have turned on court favourites, ordering executions during temper tantrums.

Regardless of the circumstances, Sonni Ali learnt his lesson well. Never again was he left at the mercy of someone else's fleet. He built up a river-based navy of over 400 boats, and used them to good effect in his next conquest - the trading city of Jenne (now Djenné). The city was placed under siege, with the fleet blockading the port. Although it took seven years for the siege to work, the city fell to Sonni Ali in 1473. The Songhai Empire now incorporated three of the greatest trading cities on the Niger: Gao, Timbuktu, and Jenne. (All three had once been part of the Mali Empire.)

The Songhai Empire now had effective control over the lucrative Niger River trade (rivers formed the major trading routes within west Africa at that time) of gold, kola, grain, and slaves. The cities were also part of the important trans-Saharan trade route system which brought south caravans of salt and copper, as well as goods from the Mediterranean coast.

By 1476 Sonni Ali controlled the inland delta region of the Niger to the west of Timbuktu, and the lakes region to the south. Regular patrols by his 'navy' kept the trade routes open and tribute paying kingdoms peaceful. This is an extremely fertile region of west Africa, and it became a major producer of grain under his rule.

A 17th century chronicle tells the tale of Sonni Ali's slave-based farms. When he died 12 'tribes' of slaves were bequeathed to his son, at least three of which had been obtained when Sonni Ali initially conquered parts of the old Mali empire. Whereas under the Mali Empire slaves were individually required to cultivate a measure of land and provide grain for the king; Sonni Ali grouped the slaves into 'villages', each to fulfil a common quota, with any surplus to be used by the village. Under Sonni Ali's rule children born in such villages automatically became slaves, expected to work for the village or to be transported to the trans-Saharan markets.

Sonni Ali was brought up as part of an exclusive ruling class, a warrior horseman - the region was the best in Africa south of the Sahara for breeding horses. As such he commanded an elite cavalry, with which he was able to pacify the nomadic Tuareg to the north. With cavalry and navy he repulsed several attacks by the Mossi to the south -- including one major attack which reached all the way to the Walata region north west of Timbuktu! -- and defeated the Fulani of the Dendi region, which was then assimilated into the Empire.

Under Sonni Ali the Songhai Empire was divided up into territories which he placed under the rule of trusted lieutenants from his army. Traditional African cults and the observance of Islam were combined, much to the annoyance of Muslim clerics in the cities -- and plots were hatched against his rule. On at least one occasion a group of clerics and scholars at an important Muslim centre were executed for treason.

Sonni Ali died in 1492 as he returned from a punitive expedition against the Fulani. Oral tradition has him poisoned by Muhammad Ture, one of his commanders. A year later Muhammad Ture staged a coup d'etat against Sonni Ali's son, Sonni Baru, and founded a new dynasty of Songhai rulers. Askiya Muhammad Ture and his descendants were strict Muslims, who reinstated orthodox observance of Islam and outlawed traditional African religions.

In the centuries which followed his death Muslim historians recorded Sonni Ali as "The Celebrated Infidel" or "The Great Oppressor". Songhai Oral tradition records that he was the righteous ruler of a mighty empire which stretched over 3,200 kilometres (2,000 miles) along the Niger River.