Tristan + Isolde (2006)

Genre: Action | Adventure | Drama | Romance
Starring: James Franco, Sophia Myles, Rufus Sewell, and David O'Hara
Tagline: Before Romeo & Juliet, there was...
Plot: An affair between the second in line to Britain's throne (Franco) and the princess of the feuding Irish (Myles) spells doom for the young lovers.

This longtime dream project of executive producers Tony Scott and Ridley Scott explores the medieval legend of a princess and warrior’s love affair, which threatens to tear apart an uneasy peace between England and Ireland. A tale of epic battles, royal intrigue and a timeless, star-crossed passion.

http://www.imdb.com/title/tt0375154/
http://en.wikipedia.org/wiki/Tristan_&_Isolde_(film)