Hell, I would say Andraste is probably based on Boudica and Joan of Arc (some people say Jesus as well, but he wasn't a warrior).
Those are often examples cited as her inspiration. But, you know, I just found something interesting while I was checking this article. I honestly didn't know this until I just read it.
There are some other lesser-known examples of women warriors given ... but here's the sentence that caught my eye.
http://en.wikipedia....folklore#Europe
Andraste is a Celtic war goddess invoked[15] by Boudica while fighting against the Roman occupation of Britain in 61 CE
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(elsewhere from Wikipedia)
Andraste, also known as Andrasta or Andred, was, according to the Roman historian Dio Cassius, an Icenic war goddess invoked by Boudica in her fight against the Roman occupation of Britain in AD 60.[1] She may be the same as Andate, mentioned later by the same source, and described as "their name for Victory": i.e., the goddess Victoria.[2] Thayer asserts that she may be related to Andarta also. The goddess Victoria is related to Nike, Bellona, Magna Mater (Great Mother), Cybele, and Vacuna—goddesses who are often depicted on chariots.
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So the DA Andraste may be based on Boudica, but it seems she's named for Boudica's Celtic goddess patroness.
An even more detailed page on the Celtic warrior goddess.
This should also grab peoples' attention. Of course, the reference here is to an Irish warrior goddess.
Andraste is a warrior goddess, the goddess of victory, of ravens and of battles, similar in many ways to the Irish war goddess Morrigan.
[snip]
She is linked with Morrigan known as the Great Queen in Ireland. She is also associated with the triple war goddess whose three persons are Nemain (Frenzy), Badb Catha (Battle Raven) and Macha (Crow) whose sacred birds were fed allowed to feed on the stake impaled heads of those slaughtered in battle.
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(Looks over at the raven/crow to the right of the screen, which has garnered so much attention.)