Josh Celts

Basic Article
http://www.the-orb.net/encyclop/early/origins/rom_celt/celticfringe.html

Gallowglass
http://en.wikipedia.org/wiki/Gallowglass

CELT
Celt covers a LOT of time and area. To get an impression, you need to narrow it down.
You could be anything from a near naked man with blue paint and a spear to A fully plate armoured knight in imported Millanese full plate.

Choices
Time period - wealth - localised/ influenced - travelled  - location

Time Period
Pre-Roman - Roman - Iron Age - Transition/ Viking - Post Norman - Post Plauge - Renaissance

Wealth
Are you portraying a wealthy man or a basic soldier

Localised
Are you portraying a localised persona or a heavily influenced person - Romanised/ Vikingised/ Adpoted imported plate etc

Travelled
Are you a stay at home local man or have you travelled to pick up external influences and ways

Location:
Good Map
http://en.wikipedia.org/wiki/Celts

Insular Celt, Continental Celt