In 460 AD, the Goths leaded by Odoacer invade Rome; kill the parents of the Caesar Romulus Augustus and send the boy and his tutor Ambrosinus to a prison in Capri. The govern of Constantinople together with Senator Nestor send the warrior Mira to help the loyal commander Aurelius to rescue Romulus with a few soldiers that have survived the attack and bring him to Constantinople. They succeed in their mission but when they return, they discover that they have been betrayed by Nestor. Without any other alternative, they navigate to Britannia to meet the last Roman legion, but they have a huge surprise.

The title is translated as "The Legend of King Arthur's Sword" in Thai.

Demetrius:
You kept your armor after all these years?


Tertius:
Ten years as a farmer gives you something worth fighting for. Twenty as a legionary teaches you to be ready for the day.


Demetrius:
Good man.

Audio/visual unsynchronized: As Romulus passes Caesar's guard in the coronation procession (at 00:09:56), Demetrius mouths the words "We're dead." (In the DVD commentary it is explained that "we took it out just because it was too soft to be heard over the noise of the procession and the music.")