A coin with the emperor and his mom Zoe
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Constantine Porphyrogenitus :
De Administrando Imperio (The Imperial Administration)
(10th cent) Byzantine Emperor
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Taken from : B. Lewis : Race and Slavery in the Middle East

The Daily tribute paid to the Byzantine Emperor by the Caliph' Abd al-Malik included as well as money one purebred horse and one black slave.
An earlier agreement between the emperor and Mu'awiya provided for the annual delivery of fifty purebred horses but no black slaves.

Note: Here we have the first documented wave of arrivals of East Africans in Eastern Europe.