A description of Celts by the Roman historian Diodorus:

Their aspect is terrifying...They are very tall in stature, with rippling muscles under clear white skin. Their hair is blond, but not naturally so: they bleach it, to this day, artificially, washing it in lime and combing it back from their foreheads. They look like wood-demons, their hair thick and shaggy like a horse's mane. Some of them are clean shaven, but others - especially those of high rank, shave their cheeks but leave a moustache that covers the whole mouth and, when they eat and drink, acts like a sieve, trapping particles of food...The way they dress is astonishing: they wear brightly colored and embroidered shirts, with trousers called bracae and cloaks fastened at the shoulder with a brooch, heavy in winter, light in summer. These cloaks are striped or checkered in design, with the separate checks close together and in various colors.

[The Celts] wear bronze helmets with figures picked out on them, even horns, which make them look even taller than they already are...while others cover themselves with breast-armor made out of chains. But most content themselves with the weapons nature gave them: they go naked into battle...Weird, discordant horns were sounded, [they shouted in chorus with their] deep and harsh voices, they beat their swords rhythmically against their shields.