Under the reign of mansa musa, what happened to the city of timbuktu?

It was under Mansa Musa that Timbuktu became the world's major cultural centers.

During his rule it became one of the biggest cultural centers in the world. Mansa Musa was focused on building things like universities and libraries, museums, palaces, mosques. He employed many scholars and artists and people from all over the world flocked to educate themselves and participate in this era of enlightenment.