Coptic Egyptian Carved Limestone Relief, 6th century

A 6th century Coptic Egyptian carved limestone relief, probably illustrating the story of Joseph being taken to Egypt. Note that the 'Arab' horseman leading the camel on which young Joseph probably rides is himself riding side-saddle. This seems to have been a bedouin habit and can be seen in a few other sources, including at least one wall-painting from Transoxania which was made around the time of the Arab-Islamic invasion. (Coptic Museum, inv. 8001, Cairo, Egypt; David Nicolle photograph)
Source: p.27, EH - 071 - The Great Islamic Conquests AD 632-750 by David Nicolle

See also Illustrations of Arab Costume and Soldiers
Illustrations of Costume and Soldiers from Coptic and Nubian sources