The ruler who instituted Friday prayers in Mali was
Answer Details
The ruler who instituted Friday prayers in Mali was Mansa Musa. He is known for his Hajj journey to Mecca in 1324, where he distributed a large amount of gold and brought back scholars and architects to Mali. He is also known for his contribution to the spread of Islam in West Africa, including the establishment of Friday prayers as a regular practice in Mali. Therefore, the correct option is Mansa Musa.