Of course he should have been at work. Today had been a busy day, for a whole fleet of Norse ships had come sailing up the great river to be berthed and unloaded. Wuffa’s father Coenred was employed by Aethelberht, the Kentish overking who owned the city, to oversee the trade that trickled through the huge old concrete wharves along the river. Wuffa, twenty years old, the second son of Coenred’s third wife, was expected to do his share. But trade bored him. He especially hated the desolating stink of the slave pens. Recently there had been hundreds of slaves to be shipped out, British-Roman captives from the German kings’ campaigns in the west and north.

And he itched to fight. Wrestling matches with his brothers were no longer enough. There was no peace in Britain, and it wouldn’t be hard to find an army to fight for, a war to win, a fortune to make, although he would have to leave home to do it.

In the meantime all he wanted was another window to smash. He bent to pick up another cobble.

He saw something move. Across the street, beyond a low wall: large, heavy, a flash of golden hair. Without thinking Wuffa pivoted and fired off the cobble. He heard a satisfying thud of rock on flesh.

‘Ow!’ His target straightened up. It was a man, dressed in a leather tunic and trousers, with a ragged shock of blond hair. He was carrying some kind of spade. And he was clutching his balls. He glared at Wuffa and began striding across the road. He was big, with muscles that bulged through his sleeves. He spat abuse in a Norse tongue of which Wuffa could make out only one word: ‘Arsewipe’.

Wuffa was a Saxon warrior, son of Coenred, and he stood his ground, his hand hovering at the hilt of his seax, his bone-handled knife.

The big Norse came to a halt not an arm’s length from Wuffa. The Norse was about Wuffa’s age, around twenty, and they were both blond and fair-skinned, and dressed similarly in leather tunic and trousers. But Wuffa wore his hair in the Saxon style, shaved at his forehead and long at the back of his neck, while the Norse wore his yellow mane loose and ragged.

Wuffa recognised this man. ‘I know you,’ he said in his own tongue. ‘You’re from the fleet at the wharf.’

The Norse fired out more insults.

Wuffa tried again, in Latin. ‘I know you.’

At least that stopped the flow of abuse. ‘So what, arsewipe?’

Britain was an island populated by Roman-British, Germans and Irish, with traders always streaming over from the continent. Most adults knew a little Latin, a relic of empire, the only common tongue. This young Norse was no exception. Though he evidently didn’t know the Latin for ‘arsewipe’.

‘I am Coenred’s son. We are unloading your boats—’