What major African city became prominent under Mali rule and what was it famous for?

Timbuktu became prominent under Mali rule and was famous for its learning and scholarship.

At its height, in the 14th century, Timbuktu was a great hub of Islamic learning and trade in West Africa. Its libraries held thousands of manuscript books and scholars from across the region studied science, mathematics, architecture, philosophy, ethics, medicine, language, literature, linguistics, astronomy, law, logic, Quranic sciences, and religious rituals, among other topics.