Why is a Tanzanian chief's skull mentioned in the Versailles Treaty?

Why is a Tanzanian chief's skull mentioned in the Versailles Treaty?

bbc.co.uk - Damian Zane

The Treaty of Versailles, signed exactly a century ago, reshaped Europe in the wake of World War One. So why, within its many hundreds of clauses, does the treaty refer to the decapitated head of an African anti-colonial hero?

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