‘And not just the Scots,’ Finan said.

‘Not just the Scots,’ I agreed. Ships from Scotland, from East Anglia, from Frisia, and from all the Viking homelands sailed past our coast. Even ships from Wessex. And I had never charged duty on those cargoes. I reckoned it was none of my business if a Scotsman sailed past my coast with a ship filled with pelts or pottery. True, if a ship put into one of my harbours then I would charge a fee, but so did everyone else. But now a small fleet had come to my waters and was levying a duty in my name, and I suspected I knew where that fleet had come from. And if I was right, then the four ships had come from the south, from the lands of Edward, Anglorum Saxonum Rex.

Spearhafoc plunged her bows into a green sea to shatter a hard white foam along her decks. Banamaðr was pitching too, driven by a rising west wind, both of us sailing southwards to hunt down the ships that had killed my tenants, and if I was right about those ships, then I had a bloodfeud on my hands.

A bloodfeud is a war between two families, both sworn to destroy the other. My first had been against Kjartan the Cruel who had slaughtered the whole household of Ragnar, the Dane who had adopted me as a son. I had welcomed that feud, and ended it too by killing both Kjartan and his son, but this new bloodfeud was against a far more powerful enemy. An enemy who lived far to the south in Edward’s Wessex, where they could raise an army of household warriors. And to kill them I must go there, to where that army waited to kill me. ‘She’s turning!’ Finan interrupted my thoughts.

Banamaðr was indeed turning. I saw her sail come down, saw the late morning light reflected from oar-blades as they were thrust outboard. Saw the long oars dip and pull, and saw Banamaðr labouring westwards as if seeking the safety of a Northumbrian harbour.

So the bloodfeud, it seemed, had come to me.

I had liked Æthelhelm the Elder. He had been Wessex’s richest ealdorman, a lord of many estates, a genial and even a generous man, and yet he had died as my enemy and as my prisoner.

I had not killed him. I had taken him prisoner when he fought against me, then treated him with the honour that his rank deserved. But then he had caught a sweating sickness, and though we had bled him, though we had paid our Christian priests to pray for him, and though we had wrapped him in pelts and given him the herbs that women had said might cure him, he had died. His son, Æthelhelm the Younger, spread the lie that I had killed his father, and he swore to take revenge. He swore a bloodfeud against me.

Yet I had thought of Æthelhelm the Elder as a friend before his eldest daughter married King Edward of Wessex and gave the king a son. That son, Æthelhelm’s grandson, Ælfweard, became the ætheling. Crown Prince Ælfweard! He was a petulant and spoiled child who had grown to be a sour, sullen and selfish young man, cruel and vain. Yet Ælfweard was not Edward’s eldest son, that was Æthelstan, and Æthelstan was also my friend.