A galea was a Roman soldier's helmet. Some gladiators, myrmillones, also wore a bronze galea with a face mask and a decoration, often a fish on its crest. The exact form or design of the helmet varied significantly over time, between differing unit types, and also between individual examples - pre-industrial production was by hand – so it is not certain to what degree there was any standardization even under the Roman Empire. The primary evidence is scattered archaeological finds, which are often damaged or incomplete. There are similarities of form and function between them.