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Referenced on p33, MAA - 320 Armies of the Caliphates 862-1098 by David Nicolle:
A 10th century ivory plaque from Egypt, showing two guardsmen. (Louvre, inv. 6701B, Paris)
Referenced as figure 148 in The military technology of classical Islam by D Nicolle
148. Ivory plaque, 10th century AD, Fāṭimid, Louvre, Paris (Kuh).