Where have our Eagles gone?

[Theodosius the Great]

Ammianus mentions the eagles still being in use during the election of Valentinian I (364 AD).

I've read that this is the last legion to have existed, that it lasted into the Byzantine era and may have not been destroyed until the Battle of Yarmuk (reign of Heraclius) or in a last stand at the isle of Elephantine (either during Phocas' reign just prior to that of Heraclius in the Persian conquest of Egypt or at the end of Heraclius' reign during the Arab conquest of Egypt). Any chance that this last legion kept its Eagle to the end?

The reign of Heraclius is almost certainly the latest period that gold or silver eagles could have been in use. Heraclius was so desperate for funds to raise and sustain new armies that he had pressured the church to 'loan' much of its silver and gold plate which was promptly melted down to mint new coinage.

~Theo