Negro Soldiers in Mediterranean Armies, 12th-13th centuries
Ian Heath based his Negro Soldiers, 12th-13th centuries on:
the Mosaic from the church of S. Maria Maggiore, Vercelli
Negro Swordsmen in the Capitals of Monreale Cathedral, Palermo, Sicily, 1174 to 1182 AD
Cantiga 46 - A Moor made war on Christians and won a great booty
Cantiga 63 - Muslim soldiers under Almanzor (al-Mansur) attack San Esteban de Gormaz, in 989 CE
Cantiga 99 - The Moors realised that God was punishing them for desecrating the church
There is also:
A drawing of a Sudanese archer by Ian Heath
Negroid warriors with mace in the capitals in the Cloister of Monreale Cathedral near Palermo in Sicily
Two infantry fighting with maces and shields on the bronze doors of Trani Cathedral
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Illustrations of Costume & Soldiers