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II

The elderly parish priest, the same Arthur who had cherished her before, walked with Agnes to the church.

It was a hot, humid day, and England was a feverish green, lacking colour now the flowers of early summer had gone, and the air was full of busy insects. It was quite a contrast to the brilliant, arid severity of Spain. Yet Agnes was glad to be back, for this was her home. Even the ache in her damaged mouth didn't seem so bad here.

They came to her old cell, still fixed on the wall of the church. It was strange to Agnes to peer on it from outside. It looked so tiny, yet once it had been her whole world.

But it had changed. The squint, the one tiny window, had been stopped up with loose brick.

Arthur said regretfully, 'I'm afraid we have to contain her. The noises she makes are sometimes rather disturbing. The screams, you know. The yelling in half a dozen languages. Some of my flock believe she is possessed, not by the Holy Spirit but by His malevolent counterpart. Oh, we miss you, Agnes! There's no other word for it. My flock were drawn to your piety and your patience. They loved you in a way they will never love her.'

Somewhere in Agnes's bruised heart, she was touched. She had a bit of parchment with her and some charcoal. She scribbled, But she more interesting. True word of God in her rambling. Truth that underlies the universe. Chaos of it all.

He looked at her strangely. 'You have changed. You have been hurt.'

Hurt long before I went into cell. Won't go back. Other plans.

He nodded, accepting, regretful, wary.

On impulse Agnes bent and pulled one brick out of the stopped-up squint.

There was a rat-like scrabbling, and a single pale eye was pressed to the hole, its pupil huge from the darkness within. 'You. You hell-spawned witch! I should have destroyed you while I had the chance-'

Agnes rammed the brick back in the hole.

'You see what I mean about stopping her up,' said the priest, troubled.

Better this than Inquisition. By the time she's got her grave dug out she'll find peace.

'I pray you are right,' said the priest.

Agnes and Arthur walked away from the church, while the verdant life of the English summer rustled and swarmed around them. But if she listened hard, Agnes could still make out the cries of the woman trapped in the brick cell.

'I am Grace Bigod. My ancestors fought with the Conqueror, took the Cross, and built a holy kingdom in the Outremer. I do not deserve this – not this! Let me out, oh, let me out…'

Afterword

I'm very grateful to Adam Roberts for his expert assistance with the Latin of the Incendium Dei cryptogram.

A general history of Islamic Spain is Richard Fletcher's Moorish Spain (Weidenfield amp; Nicolson, 1992). I have used Fletcher, and the Encyclopaedia Britannica (2001 edition), as references for variant spellings of personal names, both Moorish and Christianised.

I also used Fletcher as a reference for spellings of Spanish place names, which varied through the period covered here, and many sites had both Christian and Moorish names. I have used the term 'al-Andalus' to mean that part of the Iberian peninsula under the control of the Moors at any given time, and 'Spain' to mean the Iberian peninsula itself; the peninsula of course includes modern Spain and Portugal, both of which coalesced as political entities during the period up to 1492. Regarding names in England I have generally defaulted to modern versions. In all my choices I have aimed primarily for clarity.

The words 'crusade' and 'crusader', which I have used here for clarity, are relatively modern terms, derived from the twelfth-century term crucesignati (signed by the cross).

The historical 'turning point' at Poitiers, AD 732, was regarded by Edward Gibbon as 'an encounter which would change the history of the world'. In his Decline and Fall of the Roman Empire (1776-1788), Gibbon opined that following an Arab victory, 'Perhaps the interpretation of the Koran would now be taught in the schools of Oxford, and her pulpits might demonstrate to a circumcised people the sanctity and truth of the revelation of Mahomet.' A more recent essay covering Poitiers is by Barry S. Strauss in What If? (Putnam's, 1999); in the same volume Cecelia Holland speculates on the turning-back of the Mongols in 1242.

An account of the English opposition after the Norman Conquest is Peter Rex's The English Resistance (Tempus, 2004).

The eleventh-century 'flying monk' Aethelmaer of Malmesbury (or Eilmer, Elmer or Oliver) was an historical character, mentioned in William of Malmesbury's twelfth-century history Gesta Regum Anglorum ('The History of the English Kings'). I have based some of Aethelmaer's (fictitious) engine designs on the sketches of Leonardo da Vinci (1452- 1519), including the gunpowder engine; see for example Leonardo da Vinci's Machines by Marco Cianchi (Becocci Editore, 1984). The career of the ninth-century Moorish aviator Ibn Firnas is described in, for example, the Dictionary of Scientific Biography (Scribner). An airport to the north of Baghdad is named after him, as is a crater on the Moon.

Roger Bacon, born c. 1220, was another historical character, a philosopher, educational reformer and an early proponent of experimental science. Bacon was indeed the first European to describe the properties of gunpowder, and he speculated on its use in weaponry. This was largely based on a study of Chinese firecrackers brought to him from the Mongol court by a missionary called William Ruysbroek, a few years after the date of Bacon's fictitious encounter with the Engines of God shown here (Part II Chapter XXII). However (in our timeline) the manufacture of gunpowder remained unknown in the west for decades after Bacon, and the flintlock musket was not developed until c. 1550. See Brian Clegg's The First Scientist: A Life of Roger Bacon (Constable, 2003), Gunpowder by Clive Ponting (Chatto amp; Windus, 2005), and Joseph Needham's Science and Civilisation in China (Cambridge University Press, 1962).

A recent reference on the Black Death is The Great Mortality by John Kelly (Fourth Estate, 2005). The notion that the Chinese in their great age of exploration in the fifteenth century might have reached Australia and perhaps gone much further is set out in Gavin Menzies's 1421: The Year China Discovered America (Transworld, 2002).

A solid reference on the life of Columbus, based on the primary sources, is The Worlds of Christopher Columbus by William D. Phillips and Carla Rahn Phillips (Cambridge, 1992). A recent study of the events of the years leading up to 1492 is James Reston's Dogs of God: Columbus, the Inquisition and the Defeat of the Moors (Doubleday, 2005).

My research for this book took me to Ronda, Granada, Cordoba, Seville and elsewhere in Andalucia, as well as locations closer to home such as Harbottle in Northumberland. As I noted in the first book of this series, there is no substitute for visiting such wonderful places.

Any errors or inaccuracies are my sole responsibility.

Stephen Baxter

Northumberland

February 2007