His defiance crumpled. The spears, which he had been hoarding in hope of another campaign to put a Christian on Dumnonia’s throne, were concealed in a crypt beneath the altar. The entrance to the crypt was hidden, for it was a place where the treasures donated by folk seeking Sulis’s healing power had once been concealed, but the frightened priest showed us how to lift the marble slab to reveal a pit crammed with gold and weapons. We left the gold, but carried the spears out to Cildydd’s levy. I doubted the sixty men would be of any real use in battle, but at least a man armed with a spear looked like a warrior and, from a distance, they might give the Saxons pause. I told the levy to be ready to march in the morning and to pack as much food as they could find.

We slept that night in the temple. I swept the altar clear of its Christian trimmings and placed Minerva’s head between two oil lamps so that she would guard us through the night. Rain dripped from the roof and puddled on the marble, but sometime in the small hours the rain stopped and the dawn brought a clearing sky and a fresh chill wind from the east.

We left the city before the sun rose. Only forty of the city’s levy marched with us for the rest had melted away in the night, but it was better to have forty willing men than sixty uncertain allies. Our road was clear of refugees now, for I had spread the word that safety did not lie in Corinium but at Glevum, and so it was the western road that was crammed with cattle and folk. Our route took us east into the rising sun along the Fosse Way which here ran straight as a spear between Roman tombs. Guinevere translated the inscriptions, marvelling that men were buried here who had been born in Greece or Egypt or Rome itself. They were veterans of the Legions who had taken British wives and settled near the healing springs of Aquae Sulis, and their lichen-covered gravestones sometimes gave thanks to Minerva or to Sulis for the gift of years. After an hour we left the tombs behind and the valley narrowed as the steep hills north of the road came closer to the river meadows; soon, I knew, the road would turn abruptly north to climb into the hills that lay between Aquae Sulis and Corinium.

It was when we reached the narrow part of the valley that the ox drivers came running back. They had left Aquae Sulis the previous day, but their slow wagons had reached no further than the northwards bend in the road, and now, in the dawn, they had abandoned their seven loads of precious food. ‘Sais!’ one man shouted as he ran towards us. ‘There are Sais!’