‘Candidus is concentrating his forces at Diospolis Magna. In addition to the Twenty-Second Legion, he has two infantry cohorts of auxiliaries and two cavalry cohorts. That is all that can be spared. I have scraped together every spare man that I can to join the army. Now it seems that Candidus is short of a number of officers. His senior tribune was the officer commanding the auxiliary force defeated by the Nubians. He was killed in the fight. Candidus is also short of the full complement of centurions. Several of them were on detachment to frontier posts acting as magistrates. They were lost when the Nubians crossed the border.’ Petronius turned round to face Cato. ‘It is my decision to attach you and Centurion Macro to the Twenty-Second Legion for the duration of the present emergency.’

Cato had seen it coming and had already prepared his answer. ‘I’m sorry, sir, but I have my orders from Governor Sempronius. I am to seek and destroy the slave Ajax and his followers. Until that is achieved I am not free to carry out any other duties.’

Petronius’s expression hardened. ‘How dare you address me so haughtily, you upstart little prig. Who the hell do you think you are? You are an over-promoted junior officer. There is not a drop of noble blood in your veins. You have no family or connections in Rome worth a bent sestertius. You are nothing more than Sempronius’s little pet. You would do well to remember that.’

‘I hold the commission of prefect, sir.’

‘Oh, you may well hold the rank of prefect, for now, but your patron won’t be able to save you from cocking up one day soon. Then you’ll be broken back down to a rank more suited to your lack of years and experience.’

‘Be that as it may, for now I am under the orders of Senator Sempronius.’

‘You forget yourself, Prefect.’ Petronius smiled. ‘In Egypt I act in the name of the Emperor. There is no higher authority. If I give you a command, it is as if Claudius himself gave it. Is that not true?’

Cato pursed his lips. The governor was correct. He had the authority to do as he pleased, until recalled to Rome. He could overrule the orders of Sempronius if he wished and there was nothing Cato could do about it. ‘Yes, sir. That’s right.’

Petronius nodded his head. ‘Then the matter is decided. You, and Centurion Macro, will leave for Diospolis Magna immediately. My chief of staff has already prepared your letters of appointment. You can collect them as you leave my offices. Any questions?’

‘Yes, sir. May I take it that once the campaign against the Nubians is over, you will authorise me to renew the hunt for Ajax?’