Ahead, the air was striped with a thick layer of orange-yellow: the cumulative smoke from thousands of fires and lanterns, not yet dispersed in the morning light. On the horizon Regina glimpsed aqueducts, immense structures that strode across the landscape, imposing straight-line geometries of astonishing lengths. There were ten of them, she knew, ten artificial rivers to water a city of more than a million souls. As they neared the city, gaudy mausoleums sprouted beside the roadway. Citizens were allowed to inter bodies only outside the city walls, so routes out of the city became lined with sarcophagi. And around the cemeteries of the rich crowded the remains of the poor, the ashes of cremations stored in amphorae stuck in the ground, only their necks protruding into the air.

“The scale of it, even of their dead, is astounding,” Regina murmured.

Their driver turned to grin at her. He must have been more than sixty years old, and a single tooth stood like a stump in his mouth. He spoke a coarse country Latin she found it hard to make out.

Brica said, “What was that?”

“He welcomed us to the caput mundi. To the head of the world . . .”

They fell silent, each locked into her own thoughts, as the carriage wound its way along the crowded road.

Rome was dominated by mud brick and red tiles. But at its heart were the Capitoline and Palatine Hills with their great palaces and temples, like a floating island of gleaming marble. Regina thought she glimpsed the curving wall of the Flavian Amphitheater, astoundingly huge, like a house for giants.

But as the carriage approached the center of the city it entered a maze of streets, and the wider view was lost. The closer they got to the center the more crowded the buildings were, and the taller they seemed to grow; they were rickety heaps of wattle, daub, and crimson-red tiles, two, three, four stories high, like unhealthy plants competing for light. In some places these insulae, islands, were so closely packed together that their balconies touched, shutting out the sky altogether. The stink was overwhelming, of rotting sewage, cooking food. And the noise of the city seemed to engulf Regina, a constant clamorous racket. It was the noise of a million people, she thought, a million voices joining into one great unending roar, and as they penetrated deeper into this crowded, unplanned maze, Regina felt as if she were becoming lost in a great formless sea of people.

Brica grew even quieter, receding into herself. Probably, Regina thought, in the last hour her daughter had seen more strangers’ faces than she had seen before in her entire life.

On the driver’s recommendation they were brought to a restaurant. The owner, who happened to be the driver’s brother-in-law, also owned some of the apartments in the block above the restaurant, and the driver had promised he would rent the women a room.