The Centurion has the highest attack of all units outside of siege weapons, with 37.
With 14 melee armor, the Centurion has the highest melee armor of all units in the game.
The Macedonian Centurion has the highest pierce armor of all units in the game with a total of 5.
All of the Mediterranean civilizations have access to the Centurion and none of the Middle Eastern ones have access to them.
The smallest tactical unit in the Roman army trusted with independent maneuver was the century, standing 100 man strong (later 80 with the remaining 20 comprising administrative staff and hangers-on). Each century was commanded by a Centurion, a veteran promoted from the ranks after demonstrating bravery, skill, discipline, and leadership. The century was roughly equivalent to the modern infantry platoon and the Centurion was a combination of modern infantry platoon commander (usually a Lieutenant) and top sergeant. Centuries were further organised into cohorts - six centuries per cohort (480 men total) - with the most senior centurion taking overall command of the cohort, akin to a modern infantry company and infantry company commander (usually a Captain or Major). Centurions were the backbone of the legions that built and defended the Roman Empire.
—The Age of Empires manual
A group of Centrurions. They have the same appearance as the Phalanx.