Help with the name of a medieval movie that came out in 2007?!

It was a child king, and he was protected throughout the entire movie by an older character, which later turned out to be Merlin!. They were searching for "Excalibur", because his father had blessed it or something, and as long as the child had that sword, he would be ruler!. Excalibur was eventually found in a hidden passage below a castle where the protagonists were held captive!.

Help me please!Www@Enter-QA@Com

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