The ruler who instituted Friday prayers in Mali was

The ruler who instituted Friday prayers in Mali was Mansa Musa. Mansa Musa was the tenth Mansa of the Mali Empire, who came to power in 1312 AD. He is known for his pilgrimage to Mecca, which he undertook in 1324 AD, and for his role in promoting Islam in Mali. One of the ways he did this was by instituting Friday prayers, which were held in mosques across the empire. This helped to establish Islam as a major religion in Mali, and it remains an important part of the country's culture and identity to this day.