“I asked him ‘how was it?’ and he said ‘very good'”, the owner, identified only as Umberto, told Corriere della Sera newspaper. “I had gone up to him and said ‘Are you …?’ and he said ‘Yes’.”

It was not the first time that the multi-billionaire chose not to tip – he reportedly did the same thing the night before at Pierluigi, a historic trattoria near Campo de’ Fiori, a pizza in the heart of Rome.