Agron's Catch Phrase is: "F*cking Gauls!", usually spoken in relation to something Crixus is doing. As Gaul is basically the future France, and Agron is a German, this is almost an ancient foreshadowing of later Franco-Germanic relations across the next 2,000+ years.
The final speech delivered by Agron: "One day Rome shall fade and crumble..." is somewhat ironic as well as prophetic, since the Germanic peoples, especially the Visigoths, Vandals and Ostrogoths, would play a major role in the breakup of the Roman Empire and the sack of the city of Rome itself in 410, 455 and 546C.E. respectively.