Henry Treece 
Horned Helmet [EPUB ebook] 

Beorn was only a boy when his father jumped off Ness Rock into the sea, and was swept away like a piece of black driftwood.
It was a grey day, with the gulls and sea-mews haunting the air with their cries, as though they were mocking at Beorn for crying too. If he had had a mother he would not have cried so much, because boys in Iceland did not reckon to cry, whatever happened. But Beorn’s mother had been taken away by a shipload of vikings a year ago, when she was down on the shore gathering weed and driftwood for the fire; and now he was quite alone.