Braveheart

I'd be surprised if anyone failed to give the expected answer, but this is debatable.

Braveheart was inspired by a poem that rejoices in the title of The Actes and Deidis of the Illustre and Vallyeant Campioun Schir William Wallace – but is commonly known as The Wallace. This is believed to have been written, probably in the 1480s (i.e. about 180 years after Wallace's death) by someone called Blind Harry, of whom very little else is known.

According to Wikipedia, "The poem has some basis in historical fact with descriptions of the Battle of Stirling Bridge and the Battle of Falkirk. The factual elements of the poem are, however, combined with many fictional elements. Wallace is depicted as an ideal hero in the tradition of chivalric romance. He is described as being unfailingly courageous, patriotic, devout and chivalrous.

"The English are depicted throughout as the natural and irreconcilable enemies of the Scots."

No less a proud Scot than Billy Connolly was (characteristically) more forthright: "Braveheart is pure Australian shite. William Wallace was a spy, a thief, a blackmailer – a c**t basically. And people are swallowing it. It's part of a new Scottish racism, which I loathe – this thing that everything horrible is English. It's conducted by the great unread and the conceited w***ers at the SNP, those dreary little pr**ks in Parliament who rely on bigotry for support".