Why is an African chief's skull mentioned in the Versailles Treaty?

Chief Mkwawa died 16 years before WW1 began but his skull was mentioned in the treaty that ended the conflict. from BBC News - World https...

Chief Mkwawa died 16 years before WW1 began but his skull was mentioned in the treaty that ended the conflict.

from BBC News - World https://ift.tt/2KIgbBS