King Harold of England takes on two invasion forces. First, his brother Tostig attacks the south coast. He is repelled, but there is more to come. Later in the year, a vast Viking invasion force led by King Harald Hardrada of Norway lands in the north.
In the premiere, King Edward the Confessor dies without an heir, triggering a bitter race to succeed him as King of England. Earl Harold is on the spot and takes the crown. But in Normandy, Duke William believes the throne has been promised to him.