Which of these actors does not appear as one of the 3 sons in the film "The Lion in Winter"?

I saw this movie at the theatre while on a date. The acting and story in this picture are incredible. Funny, but after the drama and fighting it is a story about a family Christmas.

I wouldn't have thought that he would be old enough, to be in the film... unless he was a very young King Philip, or the actual person was young anyway?