Lucius jumped from his bed. His room, with a small balcony looking west, was on the upper floor of the house. Below him was the slope of the Aventine Hill. The nearer houses, along the crest of the hill, were large and well made, like his family’s house. Farther down the hill, humbler houses and tenements and artisans’ workshops were crowded close together, and farther yet was a flat expanse with large granaries and warehouses close to the Tiber. At the river the city ended. On the far side of the Tiber, woods and meadows were divided into the private estates of the rich, which extended to the far horizon of hills and mountains.

How his mother hated this view! Born into a wealthy branch of the Cornelius family, she had grown up in a house on the other, more fashionable side of the Aventine Hill, with a view of the vast Circus Maximus below, the Capitoline Hill crowned by temples off to one side, and, directly opposite, the opulent Palatine Hill, where the emperor lived. “Why, from our rooftop, when I was a girl,” she would say, “I could see the smoke from sacrifices on the Capitoline, watch the chariot races below, and even catch a glimpse of the emperor himself, strolling on one of his terraces across the way.” (“All at the same time, Camilla?” Lucius’s father would say, gently mocking her.) But this was the view Lucius had grown up with. For twenty-four years this had been the Roma seen from his room, a jumble of the rich and poor – mostly the poor – where slaves laboured endlessly in vast storehouses to accommodate all the goods and grain that arrived day after day, carried up the river from the great world beyond, the world that belonged to Roma.

The month of Maius had been overcast and rainy so far, and this day promised to be no different. By the dim light of dawn beneath an overcast sky, Lucius saw the towering cypress trees along the Tiber sway this way and that. The blustering winds were warm and carried the smell of rain. In the far distance, black storm clouds roiled on the horizon, bristling with lighting.