The Vikings - The Whole Movie (1958)
Einar and Eric are two Viking half-brothers. The former is a great warrior whilst the other is an ex-slave, but neither knows the true identity of the other. When the throne of Northumbria in Britain becomes free for the taking, the two brothers compete against one another for the prize, but they have very different motives - both involving the princess Morgana, however.
In the Middle Ages, Viking warriors continue to raid the English coast. In one such raid the Viking leader Ragnar kills the English king and forces himself on the Queen. With the King dead, his brother takes the thrown but unknown to anyone but a trusted servant, the Queen is now with child.
In order to protect the boy, he is sent away to be raised in safety away from the new King. Twenty years later, the Vikings under are still raiding England and they now have an Englishman, Egbert, making maps of the English coast for them. Ragnar has a son, Einar, a lusty warrior who takes what he wants when he wants it. They also have a slave, Eric, taken prisoner as an infant. Egbert realizes from a necklace Eric wears that he is the son of the Queen and is Einar's half-brother.
When they kidnap Morgana, a Welsh beauty and the English King's betrothed, the stage is set for an inevitable clash between the half-brothers and with the reigning English King.
(Taken from IMDb)