[6] The 13th century travel guide to Rome De mirabilibus urbis Romae describes it in detail, though there is no other evidence that the arch still existed by the time this was composed.

The arch described also had reliefs of the army, war, and the Battle of Actium wherein "Caesar, emerging from the struggle with a greater victory than he expected, pursues Cleopatra's fleeing galley.

[10] Cassius Dio mentions an ovatio and another triumphal arch granted to Augustus after he recovered the eagles lost in the Battle of Carrhae and during Antony's campaign in Atropatene[11] without specifying its location.

[15][16] Coins minted in Pergamon, Tarraco, and Rome in the years 19–16 BC show a three-bayed arch with a quadriga on the top and figures holding bows and standards on the lower bays.

The lower bays had square-topped pediments with Doric columns or semi-columns surmounted by statues of Parthians holding bows and the recovered eagles.