Lustrum

'It was.' The old general's eyes gleamed at the memory. 'I knew how to conduct a siege, even then.'

'Of course they surrendered after a couple of days, and were lodged in the senate house till their trial. But we didn't trust them not to escape again, so we got up on the roof and tore off the tiles and pelted them. There was no hiding place. They ran to and fro squealing like rats in a ditch. By the time Saturninus stopped twitching, you could barely tell who he was.'

'And Rabirius was with you both on the roof?' asked Cicero. Glancing up from my notes at the old man – his expression vacant, his head trembling slightly – it was impossible to imagine him involved in such an action.

'Oh yes, he was there,' confirmed Isauricus. 'There must have been about thirty of us. Those were the days,' he added, bunching his fingers into a gnarled fist, 'when we still had some juice in us!'

'The crucial point,' said Hortensius wearily – he was younger than his companions and obviously bored of hearing the same old story – 'is not whether Rabirius was there or not. It's the crime with which he is being charged.'

'Which is what? Murder?'

' Perduellio.'

I must confess I had never even heard of it, and Cicero had to spell it out for me. ' Perduellio,' he explained, 'is what the ancients called treason.' He turned to Hortensius. 'Why use such an obsolete law? Why not just prosecute him with treason, pure and simple, and have done with it?'

'Because the sentence for treason is exile, whereas for perduellio it's death – and not by hanging, either.' Hortensius leaned forward to emphasise his words. 'If they find him guilty, Rabirius will be crucified.'

'What is this place?' demanded Rabirius, getting to his feet. 'Where am I?'

Catulus gently pressed him down into his seat. 'Calm yourself, Gaius. We're your friends.'

'But no jury is going to find him guilty,' objected Cicero quietly. 'The poor fellow's clearly lost his brains.'

' Perduellio isn't heard before a jury. That's what's so cunning. It's heard before two judges, specially appointed for the purpose.'

'Appointed by whom?'

'Our new urban praetor, Lentulus Sura.'

Cicero grimaced at the name. Sura was a former consul, a man of great ambition and boundless stupidity, two qualities which in politics often go together.

'And whom has Old Sleepy-Head chosen as judges? Do we know?'

'Caesar is one. And Caesar is the other.'

' What?'

'Gaius Julius Caesar and his cousin Lucius are to be selected to hear the case.'

' Caesar is behind this?'

'Naturally the verdict is a foregone conclusion.'

'But there must be a right of appeal,' insisted Cicero, now thoroughly alarmed. 'A Roman citizen cannot be executed without a proper trial.'

'Oh yes,' said Hortensius bitterly. 'If Rabirius is found guilty, of course he has the right of appeal. But here's the catch. Not to a court – only to the entire people, drawn up in full assembly, on the Field of Mars.'

'And what a spectacle that will be!' broke in Catulus. 'Can you imagine it? A Roman senator on trial for his life in front of the mob? They'll never vote to acquit him – it would rob them of their entertainment.'

'It will mean civil war,' said Isauricus flatly, 'because we won't stand for it, Cicero. D'you hear us?'

'I hear you,' he replied, his eyes rapidly scanning the writ. 'Which of the tribunes has laid the charge?' He found the name at the foot of the document. 'Labienus? He's one of Pompey's men. He's not normally a troublemaker. What's he playing at?'

'Apparently his uncle was killed alongside Saturninus,' said Hortensius with great contempt, 'and his family honour demands vengeance. It's nonsense. The whole thing is just a pretext for Caesar and his gang to attack the senate.'

'So what do you propose to do?' said Catulus. 'We voted for you, remember? Against the better judgement of some of us.'

'What do you want me to do?'

'What do you think? Fight for Rabirius's life! Denounce this wickedness in public, then join Hortensius as his defence counsel when the case comes before the people.'

'Well, that would be a novelty,' said Cicero, eyeing his great rival, 'the two of us appearing together.'

'The prospect is no more appealing to me than it is to you,' rejoined Hortensius coldly.

'Now, now, Hortensius, don't take offence. I'd be honoured to act as your colleague in court. But let's not rush into their trap. Let's try to see if we can settle this matter without a trial.'

'How can it be avoided?'

'I'll go and talk to Caesar. Discover what he wants. See if we can reach a compromise.' At the mere mention of the word 'compromise', the three ex-consuls all started to object at once. Cicero held up his hands. 'He must want something. It will do us no harm at least to hear his terms. We owe it to the republic. We owe it to Rabirius.'

'I want to go home,' said Rabirius plaintively. 'Please can I go home now?'

Cicero and I left the house less than an hour later, the unfamiliar snow crunching and squeaking beneath our boots as we descended the empty street towards the city. Once again we went alone, which I now find remarkable to contemplate – this must have been one of the last occasions when Cicero was able to venture out in Rome without a bodyguard. He did however pull up the hood of his cloak to avoid being recognised. Even the busiest thoroughfares in daylight could not be counted safe that winter.

'They will have to compromise,' he said. 'They may not like it, but they have no choice.' He suddenly swore, and kicked at the snow in his frustration. 'Is this what my consulship is going to consist of, Tiro? A year spent running back and forth between the patricians and the populists, trying to stop them tearing one another to pieces?' I could think of no hopeful reply, so we trudged on in silence.

Caesar's home at this time stood some way beneath Cicero's, in Subura. The building had been in his family for at least a century and had no doubt been fine enough in its day. But by the time Caesar had come to inherit it, the neighbourhood was impoverished. Even the virginal snow, smudged with the soot of burned-out fires and dotted with human shit thrown from the tenement windows, somehow served only to emphasise the squalor of the narrow streets. Beggars held out trembling hands for money, but I had brought none with me. I recall urchins pelting an elderly, shrieking whore with snowballs, and twice we saw fingers and feet poking out from beneath the icy mounds that marked where some poor wretch had frozen to death in the night.

And it was down here in Subura, like some great shark attended by shoals of minnows hoping for his scraps, that Caesar lurked and awaited his chance. His house was at the end of a street of shoemakers, flanked by two tottering apartment blocks, seven or eight storeys high. The frozen washing strung between them made it seem as though a pair of drunks with torn sleeves were embracing above his roof. Outside the entrance a dozen rough-looking fellows stamped their feet around an iron brazier. I felt their hungry, crafty eyes stripping the clothes from my back even as we waited to be admitted.

'Those are the citizens who will be judging Rabirius,' muttered Cicero. 'The old fool doesn't stand a chance.'

The steward took our cloaks and showed us into the atrium, then went to tell his master of Cicero's arrival, leaving us to inspect the death masks of Caesar's ancestors. Strangely, there were only three consuls in Caesar's direct line, a thin tally for a family that claimed to go back to the foundation of Rome and to have its origins in the womb of Venus. The goddess herself was represented by a small bronze. The statue was exquisite but scratched and shabby, as were the carpets, the frescoes, the faded tapestries and the furniture: all told a story of a proud family fallen on hard days. We had plenty of leisure to appreciate these heirlooms as time passed and still Caesar did not appear.