The shield is used for protecting yourself against enemies with swords, knifes or enemies who are shooting arrows. It can also be used to strike your enemy in the face or abdomen. The shield will appear in Assassin's Creed: Origins.
The shield is made out of Iron, and is almost always round.
The recordings of the first shield being used dates back to 700 BCE. Bayek used it around 40 BCE.
There are still shields today mostly riot police use a shield to protect against rocks.