Aspis Shield
In Greek warfare, the aspis was the most important piece of equipment of the hoplite (heavy infantry). Its large size covered a large portion of the holder's body and its weight (24 lbs in the show) allowed it to deliver crushing blows. Vital to maintaining the effectiveness of the Greek phalanx, the left third of the shield would protect the right flank of the man to the holder's left, hence why losing it was considered to be a disgrace.
