She nodded. ‘The first attack will be on the Thames, and that will be large enough to make you think it is their main attack. And once Arthur has gathered his forces to oppose that army, Cerdic will march in the south. He’ll run wild, Derfel, and Arthur will have to send men to oppose him, and when he does, Aelle will attack the rest.’

‘Unless Arthur lets Cerdic run wild,’ I said, not believing her forecast for a moment.

‘He could do that,’ she agreed, ‘but if he does then Ynys Wydryn will be in Saxon hands and I do not want to be here when that happens. If he won’t release me, then beg him to imprison me in Glevum.’

I hesitated. I saw no reason not to pass on her request to Arthur, but I wanted to make certain that she was sincere. ‘If Cerdic does come this way, Lady,’ I ventured, ‘he’s liable to bring friends of yours in his army.’

She gave me a murderous look. She held it for a long time before speaking. ‘I have no friends in Lloegyr,’ she said at last, icily.

I hesitated, then decided to forge on. ‘I saw Cerdic not two months ago,’ I said, ‘and Lancelot was in his company.’

I had never mentioned Lancelot’s name to her before and her head jerked as though I had struck her. ‘What are you saying, Derfel?’ she asked softly.

‘I am saying, Lady, that Lancelot will come here in the spring. I am suggesting, Lady, that Cerdic will make him lord of this land.’

She closed her eyes and for a few seconds I was not certain whether she was laughing or crying. Then I saw it was laughter that had made her shudder. ‘You are a fool,’ she said, looking at me again. ‘You’re trying to help me! Do you think I love Lancelot?’

‘You wanted him to be King,’ I said.

‘What does that have to do with love?’ she asked derisively. ‘I wanted him to be King because he’s a weak man and a woman can only rule in this world through such a feeble man. Arthur isn’t weak.’ She took a deep breath. ‘But Lancelot is, and perhaps he will rule here when the Saxons come, but whoever controls Lancelot it will not be me, nor any woman now, but Cerdic, and Cerdic, I hear, is anything but weak.’ She stood, crossed to me and plucked the letter from my hands. She unfolded it, read it a last time, then tossed the parchment into the fire. It blackened, shrivelled, then burst into flame. ‘Go,’ she said, watching the flames, ‘and tell Arthur that I wept at his news. That’s what he wants to hear, so tell him. Tell him I wept.’