With the Celts being illiterate, this led to oratories and the spoken poem, a tradition that survived even until the later Roman Empire, Symmachus, for a good example, the great orator of the fourth century was trained by a rhetorician from Gaul.
The physical appearance of the Celts is revealed by their skeletal remains, in representations of experts remaking their faces and following the descriptions of classical writers, who were greatly impressed by their height, fair skin, blue eyes and blond hair, they would have gladly welcomed the Germanics after the Romans left, as cousins.