I'm not seeing Mel Gibson here. Just not seeing it. This looks to be a 16th century portrait of the Wallace, or William Wallace, "Braveheart" and hero to the Highland people (to whom I claim more legitimate relation than Ward "Fake Indian" Churchill does to any Cherokee).
Roberts my grandfather would be - 1/4 Highland Scot that makes me. And half-Jew so that cancels out, I'm fairly certain - except the other quarter is Scots-Irish which makes me - what? A combative survivalist?
If you can make it through the very odd language of William Wallace: The Truth, there's some good information there. Clearly inspired by the film Braveheart, as in trying to correct some of the artistic license taken by Mel Gibson, "William Wallace the Truth" is proof that there are many Englishes, and perhaps - some of them aren't all "English" as most know it.
Now, according to "William Wallace the Truth," The Wallace was conceivably descended from "Richard the Welshman," which makes a little sense considering the "Wallace" surname. At a reported 6'7", William Wallace was a true giant of a man, especially in the 13th century (he was born in 1270 or 1272).
Now, this portrait of Wallace might be a bit closer to the real man, as this is clearly the face of a tall man, and with dark hair and eyes, might be descended from "Richard the Welshman." Now, Wallace's nemesis, against whom he led the Scottish people in the name of freedom, was Edward Plantagenet or Edward "Longshanks," King of England. By all accounts a tall, remorseless, evil bastard, Longshanks seems to have been, at 6'2", a full five inches shorter than Wallace. This might seem a minor point, except that both were exceptionally tall for their day, and - well, Wallace was a hero and Longshanks was reduced to torturing an unarmed prisoner to prove what a great guy he was (not).
William Wallace The Truth offers a great story of how, during the 8 years of guerrilla warfare Wallace conducted prior to his capture and execution, Wallace freely raided the countryside, challenging the occupying and hated English. In one incident, an English "churl" who was renowned for weightlifting had a habit of challenging passers-by to hit him on the back with a board for 3 pence to see if it would cause any damage. Wallace offered him four times that amount, whacked him with a board, and broke his back. Wallace was attacked immediately by other English soldiers, and he responded by braining one (one would hope with the "war hammer"), breaking another's neck, and Claymoring the other two before escaping into the forest.
That's my Wallace. For such a giant figure of Scottish history, it's hard to find the best information on the internet about Wallace (I have a couple of books - but there's this crazy Scottish tendency to mythologize and - well - is it this "beam me up?" stuff? I don't know). McBraveheart looks like the best place for Wallace resources, and - looks like there are McBraveheart conventions.
Which brings me to the biggest question of all: the face paint. It's well-known that in Romanized Britain, the wild Picts and Brits painted themselves blue or white and went ravening all over any unwary "civilized" Roman garrisons or Romanized citizens. That's, however, like a thousand years prior to Wallace's day. Apparently, there's no evidence for Wallace painting his face in the classic blue/white Mel Gibson style, except Wallace said he had a dream that the Virgin Mary visited him and painted the blue and white flag of Scotland on his face. So there you have it. William Wallace: hero, patriot, giant and kicker of churl-ass.
