The correct answer is Timbuktu. It became the greatest city because it was a melting pot for traders from all possible nations because it was wealthy and developed compared to other places. It was a cultural and a trading center because the ruler knew how to rule properly and made Timbuktu one of the greatest cities in the world.
<span>The answer is Timbuktu. It is an ancient city in Mali, located
in 20 km north of the River Niger. The town is the capital of the Timbuktu
Region, one of the eight administrative regions of Mali. It is best known for
its well-known Djinguereber Mosque and admired Sankore University, both of
which were established in the early 1300s under the period in office of the
Mali Empire, most famous ruler, Mansa Musa.</span>
