It was late December and from a dark grey sky blew a wind that was quick enough and sharp enough to steal your breath. Outside in the street a dozen petitioners were huddled, hoping for a word, and as soon as they saw the consul-elect stepping through his front door they ran across the road towards him. 'Not now,' I said, pushing them back. 'Not today.' Cicero threw the edge of his cloak over his shoulder, tucked his chin down on to his chest and set off briskly down the hill.

We must have walked about a mile, I suppose, crossing the forum at an angle and leaving the city by the river gate. The waters of the Tiber were fast and high, flexed by yellowish-brown whirlpools and writhing currents. Up ahead, opposite Tiber Island, amid the wharfs and cranes of the Navalia, we could see a large crowd milling around. (You will get a sense of how long ago all this happened by the way – more than half a century – when I tell you that the Island was not yet linked by its bridges to either bank.) As we drew closer, many of the onlookers recognised Cicero, and there was a stir of curiosity as they parted to let us through. A cordon of legionaries from the marine barracks was protecting the scene. Octavius was waiting.

'My apologies for disturbing you,' said Octavius, shaking my master's hand. 'I know how busy you must be, so close to your inauguration.'

'My dear Octavius, it is a pleasure to see you at any time. You know my secretary, Tiro?'

Octavius glanced at me without interest. Although he is remembered today only as the father of Augustus, he was at this time aedile of the plebs and very much the coming man. He would probably have made consul himself had he not died prematurely of a fever some four years after this encounter. He led us out of the wind and into one of the great military boathouses, where the skeleton of a liburnian, stripped for repair, sat on huge wooden rollers. Next to it on the earth floor an object lay shrouded in sailcloth. Without pausing for ceremony, Octavius threw aside the material to show us the naked body of a boy.