Arthur repeated Sansum’s message to me. ‘Is the mouse lord plotting again?’ he asked me.

‘He’s supporting both you and Meurig, Lord,’ I said sourly, ‘so that both of you will be grateful to him.’

‘But is it true?’ Arthur wondered. He hoped it was, for if Mordred attacked Arthur, then no law could condemn Arthur for fighting back, and if Mordred marched his army north into Gwent then we could sail south across the Severn Sea and link forces with Sagramor’s men somewhere in southern Dumnonia. Both Galahad and Bishop Emrys doubted that Sansum spoke truly, but I disagreed. Mordred hated Arthur above all men, and I thought that he would be unable to resist the attempt to defeat Arthur in battle.

So, for a few days we made plans. Our men trained with spear and sword, and Arthur sent messengers to Sagramor outlining the campaign he hoped to fight, but either Meurig denied Mordred the permission he needed, or else Mordred decided against an attack on Siluria, for nothing happened. Mordred’s army stayed between us and Sagramor, we heard no more rumours from Sansum and all we could do was wait.

Wait and watch Ceinwyn’s agony. Watch her face sink into gauntness. Listen to her raving, feel the terror in her grip and smell the death that would not come.

Morgan tried new herbs. She laid a cross on Ceinwyn’s naked body, but the touch of the cross made Ceinwyn scream. One night, when Morgan was sleeping, Taliesin made a counter-charm to avert the curse he still believed was the cause of Ceinwyn’s sickness, but though we killed a hare and painted its blood on Ceinwyn’s face, and though we touched her boil-ravaged skin with the burnt tip of an ash wand, and though we surrounded her bed with eagle-stones and elf-bolts and hagstones, and though we hung a bramble sprig and a bunch of mistletoe cut from a lime tree over her bed, and though we laid Excalibur, one of the Treasures of Britain, by her side, the sickness did not lift. We prayed to Grannos, the God of healing, but our prayers were unanswered and our sacrifices ignored. ‘It is a magic too strong,’ Taliesin said sadly. The next night, while Morgan slept again, we brought a Druid from northern Siluria into the sick chamber. He was a country Druid, all beard and stink, and he chanted a spell, then crushed the bones of a skylark into a powder that he stirred into an infusion of mugwort in a holly cup. He trickled the mixture into Ceinwyn’s mouth, but the medicine achieved nothing. The Druid tried feeding her scraps of a black cat’s roasted heart, but she spat them out and so he used his strongest charm, the touch of a corpse’s hand. The hand, which reminded me of the crest of Cerdic’s helmet, was blackened. The Druid touched it on Ceinwyn’s forehead, on her nose and her throat, then pressed it against her scalp as he muttered an incantation, but all he achieved was to transfer a score of his lice from his beard onto her scalp and when we tried to comb them from her head we pulled out the last of her hair. I paid the Druid, then followed him into the courtyard to escape the smoke of the fires on which Taliesin was burning herbs. Morwenna came with me. ‘You must rest, father,’ she said.