Niani sat where the trade routes crossed. One road ran north, the Manding-sila, the Mande route; another ran south, the Sarakolle-sila. Through this junction moved gold from the forest goldfields, along with kola nuts, palm oil, and ivory carried up from the treeline at the village's edge. The Mansa kept great forges here, and a garrison of the imperial army. Wealth on this scale needed making as much as guarding: this was a working capital, a place of smiths and soldiers and caravans, not merely a throne. Some scholars hold that Niani became the capital in the early twelfth century, after an older seat called Dioliba was abandoned, and that it remained Mali's center as the empire swelled to span much of West Africa.

Mansa Musa returned from his legendary pilgrimage to Mecca having spent so lavishly along the way that, the chronicles say, he disrupted the price of gold in Cairo for years. Among those he brought home was Ishak al-Tuedjin, an architect from Al-Andalus, in Muslim Spain. At Niani, al-Tuedjin raised an audience chamber for the emperor: square, crowned with a cupola, finished in plaster and decorated, in the words of one account, "with arabesques in dazzling colours." The North African historian Ibn Khaldun, writing in the fourteenth century, called it "an admirable monument." The Arab scholar al-Umari described a city of beaten-earth brick, with ceilings of beams and reeds shaped like vaulted arches or a camel's hump, and a cluster of royal palaces ringed by a circular wall.

When the Mali Empire faded in the 1600s, Niani faded with it, shrinking back into a small town. The site lay quiet until the 1920s, when excavations by Vidal and Gaillard first identified it. Guinean-Polish missions followed in 1965 and 1968 and revealed something larger than a single town: a dense, dispersed settlement, the royal core surrounded by a scatter of hamlets where the trade clans lived apart by craft, the smiths in one place, the fishermen in another. Archaeologists traced the foundations of stone houses, the mihrab of a mosque, and the walls that once enclosed the royal town. The earth at this latitude is unkind to mud brick, and the buildings al-Umari admired needed endless repair even when the empire still stood.

Niani's claim is strong but not settled. The medieval Arab geographers and the Mande oral tradition point here, and the excavated walls and mosque lend weight. Yet historians still argue. Some propose that Mali had no single fixed capital, that the court moved, that other sites such as Kangaba played their part in the imperial story. The exact ground on which Mansa Musa held court remains, in the most honest telling, a question. What is certain is that an empire of extraordinary wealth and reach existed, that it left descriptions and ruins and a place name that endures, and that the search for its center has drawn scholars to this riverbank for a hundred years. The village keeps its secret with quiet dignity.