Sundiata Keita started the empire and the empire became famous because its rulers were very rich , especially Mansa Musa I. The Mali Empire had many important cultural effects on western Africa , so the language , laws and customs spread a lot along the Niger River . The empire was founded by Sundiata Keita and became renowned for the wealth of its rulers , especially Mansa Musa I. The Mali Empire had many profound cultural influences on West Africa , allowing the spread of its language , laws and customs along the Niger River .