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Cavalry on a 12th century Seljuk Bas Relief
Seljuk horsemen of the 12th century in light armour comprising helmet and lamellar corselet. Note that the lance is wielded two-handed. Though the majority of Seljuks in Byzantine service were horse-archers some are known to have been armoured.
Source: p3 Men-at-Arms series 287 Byzantine Armies 1118-1461 by Ian Heath. Held by the Museum of Art, Seattle.