In 1330, Timbuktu was invaded and conquered by the kingdom of Mossi. While Gao had already been recaptured by Musa’s general, it was shortly after that Timbuktu was retaken by Musa as well. Once he had it firmly under his control he built a rampart and fort and added a standing army to protect the city.
While the palace is no longer standing, both the university and mosque can be found in Timbuktu to this day. Of note, the Snakore University held the largest collection of books in Africa since the Library of Alexandria, housed 25,000 students and held about a million manuscripts.