From the days of the hoplites through the creation of the legionary until the fall of the Roman Empire in the west, the Roman army remained a feared opponent, and the Roman legionary's weapons and armor, albeit with minor modifications, remained the same: a spear, a sword, a shield, and a helmet.
This is a companion discussion topic for the original content at https://www.worldhistory.org/article/1692/roman-armor--weapons/.