The interior could have housed half a legion, complete with siege artillery. The roof soared high above a graciously proportioned hall, at the end of which was an apse, with formal, marble-clad steps. Maecenas must have run his own marble yard. The floor and walls, and the frames and ledges of numerous niches in the walls were all marble-clad. The half-round stepped area at the apsidal end had probably been intended as a regal lounging point for the patron and his intimates. It was even perhaps designed as a cascade – though if so, Rutilius' funds had not run to paying for the water to be turned on this evening.

We could manage without. There was plenty to distract our audience. The decor was entrancing. All the rectangular wall niches were painted with glorious garden scenes – knee-high cross-hatched trellises, each with a recess in which stood an urn, a fountain, or a specimen tree. There were delicate plantings, perfectly painted, amidst which birds flew or sipped from fountain bowls. The artist had an astonishing touch. His palette was based on blues, turquoise and subtle greens. He could make frescoes that looked as real as the live horticulture we could see through wide doors which had been flung open opposite the apse to reveal views over a lush terrace to the distant Alban Hills.

Helena whistled through her teeth. I felt a prickle of fear that she would want this kind of art in our own new house; sensing it, she grinned.

She had positioned me to greet guests. (Rutilius was still hovering in the outside portico, hopeful that Domitian Caesar might grace our gathering.) At least that saved me having to calm my companion. He looked cool, but Helena reckoned he was churning with terror. Some people throw up at the very thought of public speaking. Being an ex-consul did not guarantee lack of shyness. Pluck went out of the job description in the days of the Scipios. All you needed now was to be someone to whom the Emperor owed a cheap favour.