‘Yes, sir. The lad’s got the makings of a fine optio. You must be quite proud that the palace can turn out lads as good at soldiering as young Cato.’

‘Refresh my memory, if you’d be so kind. What exactly is an optio?’

‘Why, he’s my second-in-command, sir,’ Macro replied, shocked by the civilian’s ignorance. ‘And good at the job too.’

‘It’s most gratifying that even the army can appreciate the worth of a good education.’

Macro produced the required flush of anger.

‘Just my little joke, Centurion. No harm intended.’

Narcissus took him by the arm and led him into the lodge of the imperial staging post. The imperial secretary was well into his middle years and his eyes peered out of crow’s-feet lines formed by a lifetime’s worth of smiling. There was no stoop in the way he carried himself and the mobility of his expression clearly matched the speed of his thinking. And yet that dry, caustic wit indicated a mind practised in the art of putting others down. Macro pressed his lips together; as long as the man was under his protection he would have to endure the inevitable slights and barbs. Narcissus, he concluded, was typical of his kind. He treated social superiors as intellectual inferiors and — as his treatment of Cato had shown — he was inclined to treat his intellectual equals as social inferiors. One just could not win with that kind of man. Best try and ignore it.

‘What are your orders, Centurion?’ Narcissus asked him when they were alone inside the lodge. ‘Your precise orders?’

‘To escort you as far as the main body of the army and then wait for the rest of the Legion in a holding area yet to be specified. That was it, sir. Other than to render you assistance should you require it.’

‘In other words, you’re to obey my orders.’

‘Yes, sir,’ Macro conceded reluctantly. ‘That’s about the size of it.’

‘Good.’ Narcissus nodded. ‘Glad to see that Vespasian managed to get that right at least.’

Macro stiffened at this unwarranted slur on his commander’s aptitude. Coming from a Roman citizen that would be bad enough — but to hear a freedman speak in this manner was a clear breach of the most basic social etiquette.

‘Centurion, we must get on the road immediately,’ Narcissus ordered, poking Macro’s chest to emphasise the point. ‘I have to reach Gesoriacum as soon as possible. Much depends on it. In fact, I can tell you that the entire campaign depends on it, and more. Do we understand one another?’

‘I’m not sure what you want me to understand, sir,’ Macro replied frankly. ‘Why the hurry?’

‘That information is given on a strictly need-to-know basis.’

‘But a whole century to guard one man?’

‘Suffice to say that some political miscreants would prefer me not to make it to Gesoriacum — and that’s all you need to know.’

‘Yes, sir.’

‘Right then,’ Narcissus resumed brightly. ‘Let’s be off. I’m travelling light; just my litter bearers and a personal bodyguard. A number of my porters have succumbed to some local ailment and I’ll need a few of your men to replace them. There are two chests outside the stables. See to it now, please, and I’ll join your line of men in a moment.’