Given the task definition and input, reply with output. In this task you will be given a text passage from a trivia quiz. You should choose the category this question belongs to from these categories: History, Science, Social Science, Fine Arts, Literature. You can only choose one category, so if in doubt, please choose the closest match.

Rulers of this empire never held absolute power due to the council of Gbara. One ruler of this empire was assisted by his general Tiramakhan and set his capital at the city of Niani. According to legend, this empire was founded after a battle in which an arrow deprived (*) Sumanguru of his magic powers. A later ruler of this empire underwent an extremely extravagant hajj to Mecca and ruled as Mansa Musa. For ten points, name this African empire that conquered Ghana and was founded by Sundiata Keita.
History