be permanent, Europe cut off from its own antiquity. And, worse, Christ would be lost from the world. With their priests slaughtered, the mass of the population slowly reverted to paganism, finding comfort in the gods they rediscovered in the trees and fields and rivers around them.
Bohemond, Philip and their companions listened to this dreadful account with growing horror.
But it need not be so, the imp whispered. Already grievous damage had been done to the cities of Russia, and even to the great Islamic civilisations of the east, which would never recover their sparkling brilliance of the past. But in the west, Christendom might yet be saved.
A tiny lid opened in the flat top of the box. Inside, revealed to the astonished men, was a pinch of crystals. This, the imp whispered, was a salt of quicksilver. If these crystals were dropped into Ogodai's milk and wine the next day the ruin of Christendom would be averted.
And then the box fell silent, and would not speak again, no matter what markings they pressed. The crystals sat in their little tray, silent, beckoning.
The Christians debated what this all meant. The soldiers like Philip discussed the Mongols' campaigns. The priests and monks explored the theological nature of the imp in the box: was it sent by God, or the devil?
And while they debated, Bohemond slipped away.
'By the end of the next day,' Thomas said, 'the Great Khan was doubled up in pain. His vomit was copious, while bloody diarrhoea hosed from his leathery backside. His doctors could do nothing. By the following morning he was unable even to pass water, and howled in agony. And by the end of the day after that he was dead. It was a horrible death – but not as dreadful as that inflicted on Brother Bohemond, who was discovered skulking in the Khan's tent.'
Like many of the other embassies, the Christian party packed up and fled in haste from the decapitated court. The Mongols' own messengers spread the news of the Khan's death to the generals and governors across their scattered domains.
'And that is why,' Thomas said, 'early in the year 1242, rather than press his conquest west, Sabotai turned back from the walls of Vienna. For all their conquests the Mongols remain tribesmen, bound by oaths of loyalty to their Khan. So when Ogodai died, their leaders were forced by their own laws to return in person to their homeland, to elect a new ruler.'
'And will they not return to Europe?' Saladin asked.
'They haven't yet. They have the rest of the world to occupy them. And as for the amulet – after the envoys had fled from the Mongol city, Philip told me they finally shattered its casing with rocks. Inside they found not the shrivelled corpse of an imp, but bits of wire. Metal discs, like coins, but blank. Other strange little sculptures.'
'Charms, perhaps,' said Saladin.
'Philip thought they were like bits of an engine. But what its function could be, how it worked – even what drove it, for there was no spring, no lever – he had no idea.'
Joan said, 'But whatever it was, why was this amulet put into the luggage of this boy Bohemond?'
'I think that's clear enough. It was put there so Bohemond should kill Ogodai. If he had lived, Christendom was lost. If he died, Christendom was saved. As simple as that. So he had to die.'
'But who could know this?… Ah,'Joan said. 'A prophet. Or-'
'Or a meddler with time,'Thomas said. 'A Weaver. A man, or an angel or a demon, with the power to speak to the past. A man stranded in this dismal future wrecked by the Khans, who managed to send back this imp-in-a- box – just as somebody, somewhere, somewhen, sent back – perhaps, perhaps! – the designs of your war machines to a young boy's addled head, and somebody else sent al-Hafredi back to the time of Charles Martel, and somebody else whispered in the ear of your ancestress Eadgyth, and, and…'
'But this was not the work of al-Hafredi's people.'
'I do not believe so. A different method was used to persuade the minds of men – an imp in a box rather than a human being thrown into history. And, though it is not clear, it seems that the makers of the amulet sought a different future from that described by al-Hafredi.'
Saladin struggled to absorb these dreadful ideas. He feared they were heretical, feared that even to speculate about such matters in the darkness of his own head might be to commit a sin.
But his mother briskly focused on the practicalities. 'I see your point,' she said to Thomas. 'He who sent Ogodai's imp may or may not have been our Weaver. But this does seem to prove that time can be spanned by an agent's will, be he human or divine.'
'Exactly.' Thomas's rheumy eyes were bright.
'Well, it's clear what we must do now. The veracity of the Codex is proved to be more than plausible.'
'You never wrote back to your cousin Subh?'
'I was never sure about that. After all Subh is a Muslim. Yet we need the Codex.'
'You're thinking of going to Seville yourself?' Thomas asked cautiously.
'Of course! I will dig up that mosque with my bare hands if needs must.'
'But the armies of the Castilians are moving in on the city. Soon it may be besieged.'
'All the more reason to move quickly, before some other chancer happens on the plans – or worse, Subh herself.' Her eyes were cold. 'I am sure now that this is our opportunity, our chance to revive our family's prospects. We must take it without hesitation.'
Saladin gladly put aside the strange mysteries of the ever-changing tapestry of time, and grasped the essence of this new mission. 'We are going to al-Andalus?' He bunched his fists. 'There are many Muslims there. I shall take the Cross!'
Joan stroked his cheek fondly. 'That's my boy.' She stood. 'We have much to do.' Briskly, still talking, planning, scheming, she led them out of the room.
Thomas hurried after her. 'Of course there is still the question of your enigma: Robert's scrap of cipher, which may or may not have something to do with that phrase in Subh's letter – Incendium Dei. As it happens I have heard of a young man who may be able to assist us, another Franciscan, a bright young philosopher at Oxford who is becoming notorious for his radical philosophies. His name is Roger Bacon…'
XVI
AD 1247
There was trouble at the pontoon bridge. A suspicious mob, a suspected spy, a near-riot – and the potential for real disaster for Seville, if its only bridge across the Guadalquivir were damaged.
This news was brought to Ibrahim's office by a sweating, panicky soldier. Ibrahim summoned Abdul, a captain of the palace guard, and told him to assemble a unit of his troops. Then he ran out of his office, without waiting to see if Abdul and his soldiers followed.
From the emir's palace, the fastest way to get to the bridge was to cut down to the river and follow the bank, and that was the way Ibrahim headed. Even so it was tough going, for every open space, every street was cluttered with refugees and their belongings. Ibrahim was forced to wade through this throng as through a sea. By the river it was almost as bad, but troops stationed here kept a path cleared along the bank, and once he was in sight of the water Ibrahim was able to make faster progress.
It was a bright spring day, he noted absently. The river water glistened prettily, and the orange trees were in bloom. But this year, the hungry would not leave the fruit on the branches long enough to ripen.
It wasn't hard to find the source of the trouble. The mob had caught their man at the abutment of the pontoon bridge. Ragged, already bleeding, his head hidden by a hood, the quarry had backed a few paces onto the bridge.
'Let me scatter them, sir.' Abdul, a veteran of the sieges of Cordoba and Valencia, was a tough, competent man of about thirty-five, who wore a black patch to hide the empty socket from which a Christian arrow had taken his right eye. 'A charge will do it.'
Ibrahim trusted Abdul with his life. But Abdul thought in a soldier's blunt, direct terms. Ibrahim's job was to see the wider picture. 'We can't risk the bridge,' he said. Seville had only two arteries to the wider Muslim world: the river, which was gradually being blockaded by King Fernando's fleet, and this pontoon bridge, which linked the
