Annius nodded, pulling at his lip. 'That would work. I've seen such designs before.' He squinted at the architect. 'And how long will this earthwork be?'

Sabinus said forcefully, 'Why, it must shadow the Wall for its whole length. What use is it otherwise?'

Nepos held up his hand. 'We'll discuss the practical consequences later. I think we all agree that some system such as this will be necessary. Now, Sabinus, concerning your legate's objections about the gates-'

Sabinus directed their attention to another corner of his sketch. 'It is clearly impractical to have the major forts set back from the line of the Wall, and to have crossing points so narrow as the mile-forts. The solution is clear. We must build new forts, each large enough to house an auxiliary unit, along the line of the Wall itself.' He showed a sketch of a fort, the classic rectangular shape lying astride the line of the Wall. 'You can see that half the fort's gates will give directly into the northern area, giving it the equivalent of six mile-fort gates. The unit will be able to deploy immediately from its fort into the north.'

Nepos glanced at Tullio. 'Prefect? Will this do?'

Tullio shrugged. 'The northern walls of the forts will be vulnerable-'

Annius said cheerfully, 'You can fix that. A few pits with stakes would do the job. But this will cut the number of crossing-points in the Wall. The locals will resent it.'

Nepos eyed him. 'The locals just tried to burn the Wall down, soldier. Let them resent.'

Tullio growled, 'Sir, you told me to bring this project in on time, within your governorship. We already had to make compromises-the turf sections for a start. Now to build these new forts-how many, tribune?'

'Twelve,' the Roman said smoothly.

'Twelve, then-'

Sabinus added, 'And I'd advise rebuilding the turf sections in stone while you're at it. A mix of turf and stone in the long run will only invite attacks along the more vulnerable turf section.'

Tullio laughed. 'Yes, let's chuck that in too! Look, governor-'

Nepos said, 'I know, Tullio, I know. Before we accept the inevitability of a rescheduling, is there any way we can speed things up? What if we reduce the width of the stone curtain, for instance? Does it have to be ten feet? What if were eight feet, or six? Wouldn't that do?…'

They began to talk around such time-saving compromises. Sabinus expertly made himself the centre of the technical discussion, excluding Xander and his sponsor Severa. Xander rolled his eyes in mute horror at this destruction of his vision.

Brigonius was more interested in Severa. As the scope of the project changed before her eyes, she was clearly losing any control over events she might once have had. Not that anybody had any sympathy for her; she had made too many enemies for that. But Brigonius wondered what was going on behind her cold, bitter face.

At last Nepos sat back. 'Well, I think we have a solution, for all but one of our problems: the timescale. Tullio?'

Tullio sighed. 'I don't imagine the Emperor will assign me the Rhine legions to finish the job?'

Nepos smiled. 'You're an honest man. I don't want you to commit yourself until you're ready. But we're talking of years more, aren't we?'

'I'm afraid so, sir.'

Nepos tapped his teeth. 'So whatever the future holds the Wall will no longer be my problem-or my glory. Well.' He stood stiffly. 'I had better begin composing my letter to the Emperor. Good day to you all.'

As he left, the others gathered up their belongings. Everybody was silent, sullen.

But Tullio slapped Brigonius on the back. 'I don't know why you're looking so serious, Brittunculus,' he said. 'Seems to me the governor has just ordered an awful lot more of your stone.'

It took another month for the final act of the rebellion's aftermath to play itself out.

The execution was to take place outside the camp at Banna. Everybody within half a day's walk of the place was summoned to attend, as were the leaders of the civitas.

At the appointed hour Brigonius walked out of the camp. He joined a dismal gathering, a hundred people or so, men, women and children, gathered around the cross on the ground. The August day was unusually warm: it was a Roman heat, Karus said, a heavy heat that flattened your lust and puddled your thinking, the heat of the conquerors.

To Brigonius's surprise, Severa joined him, with Karus. 'I wasn't expecting you two. I didn't know you had a taste for such a spectacle.'

'I certainly don't,' Karus said, his face grey. 'I see it as duty, of a grim sort. It is sometimes my role to argue for the death penalty. I think I should remind myself from time to time what that entails.'

Severa was expressionless, wrapped in a white cloak. 'As for me, I thought I should drain the dregs of a foolish disturbance which did so much damage to my ambitions. I thought that my daughter might be here, however. After all she worships a god who died in such a manner. You'd think she would see this as part of her theological education.'

'You're too hard on the girl,' Karus murmured. 'This isn't the place for her, you know. You're crushing her spirit.'

'I know my own daughter, I think.'

Karus regarded her. 'Once I admired you. I lusted after you-I'm sure you knew it. And your mind astonished me; your gaze pierced centuries. But perhaps your aloofness from history has leached you of your humanity, Severa. Perhaps you have something of the Weaver's manipulative coldness in your heart…' But his words tailed away, and Severa's glare held only contempt for this man who had been her closest ally.

As for Brigonius, he had nothing to say to Severa. Somehow the company of this vicious, thrusting woman felt appropriate on this awful day.

There was a disturbance. Brigonius turned to see a detail of soldiers dragging a prisoner out of the camp. They towered over him; he was only a boy. Brigonius and his companions had to step back to allow the party through. For a moment the boy's glance met Brigonius's. It was Similis, Tullio's British slave. The boy seemed to recognise Brigonius, who had once thanked him for bringing him a drink. Then the moment was lost, the link between their souls broken.

The soldiers briskly pushed the boy to the ground. They strapped his arms to his cross. Then they laid one foot over the other, and to pin both feet to the cross upright, drove a long iron nail through them. The sound was extraordinary, like a skewer driven into a side of pork. The boy stayed silent; he panted hard, panicky. Brigonius had heard that there was comparatively little pain associated with the nailing, oddly. With a grunting effort the soldiers raised the cross, and pushed its base into a hole in the ground. As the cross was jolted into position, Brigonius thought he heard the flesh in the boy's feet tear. Now the screaming began.

'Oh, have mercy!' Karus said, but it was a whisper, too quiet for the soldiers to hear.

Severa said bleakly, 'Mercy? The suffering is necessary. Not for him and the crime he committed, but for us, so we will not transgress in future.'

'But he didn't commit a crime,' Karus blustered. 'That's what's so monstrously unfair about it!'

The boy's guilt or otherwise didn't matter, Brigonius knew. Severa was right about that. The rebellion had been broken up, its leaders punished. But for the soldiers at Banna one loose thread had remained. Nobody had been found who had supported Matto in his strike at the very heart of their camp, nobody who had ordered him to do it, nobody who had helped him. The soldiers couldn't bear the idea that one individual acting alone could have penetrated so far into a base they thought of as secure. So somebody had to be blamed, a conspiracy concocted. And there, conveniently, was a Brigantian boy serving the prefect himself. Some whispered he had been seen at the gate when Matto arrived, or at the headquarters building before it was torched, or-