Eagle of Zeus in the context of "Krater"

An aquila (Classical Latin: [ˈakᶣɪla]; lit. 'eagle') was a prominent symbol used in ancient Rome, especially as the standard of a Roman legion. A legionary known as an aquilifer, the "eagle-bearer", carried this standard. Each legion carried one eagle. It represents the Eagle of Jove (Aëtos), being Jove the "Father of the Roman state".

The eagle had quasi-religious importance to the Roman soldier, far beyond being merely a symbol of his legion. To lose a standard was seen as extremely grave, shameful and dishonorable, and the Roman military went to great lengths both to protect a standard and to recover one if it were to be lost. For example, after the annihilation of three legions in the Teutoburg Forest, the Romans spent decades retaliating for the defeat while also attempting to recover the three lost eagles.

In Greek mythology, Aëtos (Greek: Ἀετός, romanized: Aetós, lit. 'eagle') is an earth-born childhood companion of Zeus, the king of the gods, who served as the origin of the Eagle of Zeus, the most prominent symbol of the god of thunder.