The Last Legion
This is one of the many Romans-in-England-loosely-tied-to-Arthurian-legend films that came out a few years back. Remember, there was a wave of them with Kiera Knightly and Channing Tatum and others...?
This one's got Colin Firth, Ben Kingsley, one of the most beautiful women in the world, and about half the cast of Game of Thrones (seriously). It's actually pretty good. Not Oscar-worthy, but it's a very solid B-movie with some nice character stuff and decent acting all around. If I found it for under ten bucks, I'd grab it without hesitation.