There was a long silence.

'No one could win such a battle. Except Brennus.'

'It will happen far from here?' His tone was urgent, almost frantic.

'At the very edge of the world.'

Brennus smiled slowly and released the rope. 'Ultan was a mighty druid. As are you, Tarquinius. The gods will take our centurion straight to Elysium.'

'Be sure of it.'

Romulus could still remember the glance Tarquinius had given the Gaul as they retreated towards Carrhae. Concern for Brennus filled the young soldier's heart as he pieced the comments together, but then he saw Tarquinius eyeing the fire.

'What is it for?'

The Etruscan nodded at a squat iron cauldron perched in the middle of the blaze. Sweating men in leather aprons were labouring to keep the flames burning hotly beneath it. Every so often one would lean over and stir the contents with a long-handled ladle.

'A while ago they dropped in a gold ingot.'

Romulus felt a shiver run down his spine.

The drums began again, but this time the din did not last for long. A flat-bed wagon arrived, pulled by mules and surrounded by heavy cavalry, magnificent in their chain mail. On either side strode a number of guards masquerading as lictores. Each held a fasces, the Roman symbol of justice. But unlike those used in Italy, the bundles of rods they carried were decorated with money bags and their axes with officers' heads.

'This has all been planned,' he muttered.

'It's a parody of a military triumph,' explained the Etruscan. 'And it mocks Crassus' greed for riches.'

There was a collective gasp when the soldiers saw Crassus standing in the cart, tied to a wooden frame by the neck and arms. On his head rested a laurel wreath while his lips and cheeks had been painted with ochre and white lead. A brightly coloured woman's robe completed the indignity, its fabric soaked with human waste and rotten vegetables. The general's eyes were closed, his face resigned. It had been a long journey.

The prostitutes who had accompanied the senior officers were also present. Stripped naked, cut and bruised, they wailed and clung to each other. During the campaign, Romulus had seen many rapes. And every time he had, awful images of Gemellus grunting on top of his mother had flooded back. It was part of war, but Romulus shuddered at what the women must have endured since Carrhae.

When the mules came to a halt, screams of fear rang out.

Parthian warriors swarmed on to the cart and the prostitutes were dragged by the hair on to the stage and shoved down on their knees. Whimpers were met with blows and kicks. Soon only the occasional sob escaped them.

A tall bearded man in a black robe climbed into view and gestured for silence. The crowd obeyed and the priest began speaking in a low, deep voice. Palpable anger could be heard in every word. His speech drove watching Parthians into a frenzy and they swarmed forward at the prisoners. Guards had to use real force to drive them back, wounding many with their spears.

'Rabble-rousing,' said Brennus. 'So the real entertainment can begin.'

'He is talking about what happens to any who threaten Parthia.' The Etruscan translated quickly. 'Crassus was the aggressor. But their mighty gods helped them defeat the Roman invaders. Now they require a reward.'

Romulus looked at the stage and shivered. The campaign had been damned from the start and only a fool would have disregarded the plethora of bad omens. But Crassus had ignored every last one, his monumental arrogance leading thousands of men to their deaths. He was still revolted by what was about to happen to their general. But there was nothing he could do. The young soldier breathed deeply to calm himself.

At last the bearded priest finished, content the audience understood the impending ritual. Only moans from the crucified officers and prostitutes now broke the eerie silence.

Every legionary's gaze was fixed on Crassus and the unfortunate women. A faint smile played across the priest's lips as he drew a long dagger from his belt. Moving to stand behind the first whore, he spoke a few more words.

Loud cheers rose up.

She twisted round to see, crying in anticipation and terror. Brutally her head was wrenched back to face the mob. With a smooth movement, he slashed the woman's throat.

Abruptly, the screams stopped.

Arms and legs jerked spasmodically as a fountain of blood sprayed from the gaping neck wound, covering guards and prisoners alike. The Parthian released his grip and a warrior propelled the corpse off the stage with a huge kick. Roman soldiers scattered to avoid the mutilated body landing on them.

One by one, the prostitutes suffered the same fate. Soon only Crassus remained alive. The platform ran with blood, bodies lay heaped in front, but still the crowd bayed for more.

Parthia wanted its revenge.

'Savages,' growled Brennus.

Romulus was thinking of Fabiola. For all he knew, she might have been one of the women killed. His hard-won calm was gone: he was seething. Suddenly all he wanted was to be free. To call no man master. Not Gemellus. Not Memor, Crassus or any Parthian. He glanced at the nearest guards, wondering how fast they would react if attacked. He could choose his own fate.

'You will return to Rome,' hissed Tarquinius. 'I have seen your destiny. It does not end here.'

They locked eyes as a deafening roll of drums announced the end of the ritual.

Stay strong. Like Fabiola. I will survive.

'Look.' The Gaul gestured at the stage.

The guards did not bother to untie the last prisoner. Instead they picked up the frame and placed it on the platform. A deep, almost primeval roar greeted the action.

It was time for Crassus to pay.

Sensing the end, he screamed and kicked his legs futilely. The ropes binding him were thick and strong and soon Crassus sagged against the rough timbers, his face grey with exhaustion and fear. During the struggle, his wreath had tipped sideways over one eye and the warriors pointed, smirking.

Again the priest began to speak, a tirade of fury against the man who had invaded Parthia. As spittle flew from his lips, the spectators howled with anger and surged against the guards' crossed spears once more. Tarquinius considered translating the words, but the soldiers around him needed little explanation of what was going on. And only a handful looked sorry for Crassus.

When the Parthian had finished his oration, he waited for silence to fall. Finally the mob fell back.

The general looked up and focused on the mass of ragged prisoners. By their uniforms, he would know they could only be Roman soldiers.

All that greeted him were insults.

Crassus' head slumped as the certainty of his fate began to sink in. Even his own men would not save him.

Anger still burned within Romulus. He could have happily killed Crassus in combat, but a public display like this went totally against his nature. It was as brutal as the worst depravities of the arena. He glanced at Brennus and could tell the Gaul felt the same way.

As always, Tarquinius seemed completely calm.

A smith leaned over the fire and dipped a ladle into the cauldron. Fat white globules of molten gold spilled from the lip as it emerged, narrowly missing his feet. With arms outstretched, he walked slowly towards the stage.

The crowd shrieked with anticipation and Romulus looked away.

Two guards bent Crassus' head backwards, forcing his chin up on to an angled wooden crossbar. Using loops of rope, it was bound to face the sky. The priest moved alongside and inserted a small metal vice between the prisoner's jaws. He cranked it open, baring teeth and tongue.

Crassus screamed as he realised what was about to happen. He continued wailing as the smith ascended the steps, his burning load held at arm's length.