Answer: Storytellers (griots)
Step-by-step explanation:
Compiling African history is quite the cumbersome task because it was passed down from generation to generation by storytellers called Griots who were the custodians of knowledge in the tribe and as such could be very influential.
The stories that were passed down were usually infused with a lesson to encourage certain behavior and could therefore be considered as having the acceptable laws of the tribe. Sometimes the stories were also passed down in song and performances.