The aquila was the most important military standard carried by a Roman legion, serving as a powerful symbol of Roman identity and authority. It represented the Eagle of Jove, or Aëtos, honoring Jove as the divine protector and Father of the Roman state.
Each legion was assigned exactly one aquila, which was carried into battle by a specialized soldier known as the aquilifer. The loss of an eagle in combat was considered a profound disgrace and a catastrophic omen for the legion, making its protection a primary focus during military engagements. The standard served not only as a rallying point for troops but also as a sacred object that embodied the spirit and honor of the unit.