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Also a small round sheild used by the Romans. Twenty to twenty-four inches in diameter, weighing about seven pounds.

The parma equestris was used by Roman cavalry units, the parma was also used by standardbearers and musicians, instead of a scutum, because their standards and instruments required the use of both hands. In their case the parma was an emergency self-defense shield which was carried strapped to their back.

see also:

shield
scutum
clipeus
casca
pavise