Vambraces

[Felix]

Another usage of arm protection, from the Hellenistic Era:

"Again, as an injury to the left hand may disable the horseman, we
would recommend the newly-invented piece of armour called the
gauntlet, which protects the shoulder, arm, and elbow, with the hand
engaged in holding the reins, being so constructed as to extend and
contract; in addition to which it covers the gap left by the corselet
under the armpit. The case is different with the right hand, which the
horseman must needs raise to discharge a javelin or strike a blow.
Here, accordingly, any part of the corselet which would hinder action
out to be removed; in place of which the corselet ought to have some
extra flaps[6] at the joints, which as the outstretched arm is raised
unfold, and as the arm descends close tight again. The arm itself,[7]
it seems to us, will better be protected by a piece like a greave
stretched over it than bound up with the corselet. Again, the part
exposed when the right hand is raised should be covered close to the
corselet either with calfskin or with metal; or else there will be a
want of protection just at the most vital point."

Xeonphon, On Horsemanship http://www.gutenberg.org/dirs/etext98/hrsmn10.txt chapter XII