In the
Roman Empire of the
5th century, Ambrosinus, a
Druid and member of a secret brotherhood protecting the sword of
Julius Caesar, becomes tutor to the young newly crowned
Western Emperor Romulus Augustulus. As Emperor, Romulus and his father
Orestes refuse to give the
Gothic warlord
Odoacer a third of
Italy. On the same day, Romulus meets the general of the Nova Invicta Legion,
Aurelius. Sometime after the coronation, Rome is
attacked by the Goths. Most soldiers of the Nova Invicta legion are killed while Aurelius is stunned and left for dead. Orestes and his wife are killed by Odoacer's lieutenant, Wulfila, who captures Romulus. The next day, Odoacer, now the ruler of the Western Empire, plans to have Romulus killed. At Ambrosinus' urging, Odoacer spares and exiles Romulus to
Capri instead, along with Ambrosinus himself while Wulfila and his men are sent to guard them. With Ambrosinus' help, Romulus enters a
villa built during the reign of Emperor
Tiberius and he discovers a hidden chamber there. Inside, Romulus finds a statue of Julius Caesar holding his sword, forged by a
Chalybian smith during his
invasion of Britain. Below the statue, Romulus reads a dais which states that the sword is made for "he who is destined to rule". This is interpreted as a prophecy and Romulus keeps the weapon. Ambrosinus and Romulus are soon rescued by Aurelius and his surviving soldiers Vatrenus, Batiatus and Demetrius, accompanied by Mira, an
Indian agent of the
Eastern Empire. They take Romulus to a seaport where the
Eastern Emperor has promised Romulus safe passage to
Constantinople. They barely escape after they learn that the Eastern Empire has actually betrayed them and sided with Odoacer. Ambrosinus persuades Romulus to seek refuge in
Britain, where the
lost Roman legion may remain loyal. They are eventually followed by Goths under Wulfila, who covets Caesar's sword after learning of the prophecy. After crossing the
Alps and the
English Channel, the party reaches Britain and they travel to
Hadrian's Wall. In there, they meet a man, revealed to be the legion's former commanding general, who tells the group that the legion had decided to disband and settle as farmers following
the Empire's withdrawal. However, they all live in fear of a tyrannical warlord named
Vortgyn, who is actually an old enemy of Ambrosinus. The group takes shelter in a small village where Romulus befriends a young girl named
Igraine. Meanwhile, Vortgyn teams up with Wulfila and the Goths in an attempt to get Caesar's sword so he can consolidate his position as ruler of Britain. Vortgyn attacks a number of settlements, including Igraine's village, in an attempt to force the villagers to surrender Romulus. Aurelius, wielding Caesar's sword, and Romulus mobilize an army at Hadrian's Wall to confront Vortgyn. In the
ensuing battle, Vortgyn confronts Ambrosinus in his old sanctuary while Wulfila's army quickly overwhelm Ambrosinus and Romulus' forces until the mobilized Ninth Legion arrives to help. The battle's tide is turned when Ambrosinus, who has killed Vortgyn, returns holding his golden mask. After severely injuring Aurelius in a fierce duel, Wulfila is killed by Romulus using Caesar's sword. Repulsed by the deaths in the battle, Romulus disposes of his sword, lodging it in a large stone. Many years later, Ambrosinus, now known by his Druid name
Merlin, takes a
young boy to the battlefield where he tells him of the events following the battle; Aurelius married Mira and the two raised Romulus as their son, and Romulus became a wise ruler under the name "
Pendragon" with Igraine as his wife. The boy recognises Romulus as his father and Igraine as his mother. In a final scene, Caesar's sword is shown embedded in the stone, with moss covering the original Latin inscription, now only reading "
E S CALIBVR". ==Cast==