Ammianus Marcellinus Res Gestae 29.6.1

[1] While the said general was panting through this dust of Mars throughout Mauritania and Africa, the Quadi, who had long been quiet, were suddenly aroused to an outbreak; they are a nation now not greatly to be feared, ¹ but were formerly immensely warlike and powerful, as is shown by their swift and sudden swoops in former times, their siege of Aquileia in company with the Marcomanni, the destruction of Opitergium, ² and many other bloody deeds performed in rapid campaigns; so that when they broke through the Julian Alps, the emperor Marcus Pius, ³ of whom we have previously written, ⁴ could with difficulty check them. And, for savages, they had a just cause of complaint.