The Life of Cesare Borgia by Rafael Sabatini

Cesare arrived in Rome on June 13. There was none of the usual pomp on this occasion. He made his entrance quietly, attended only by a small body of men-at-arms, and he was followed, on the morrow, by Yves d'Allègre with the army--considerably reduced by the detachments which had been left to garrison the Romagna, and to lay siege to Piombino.

Repairing to his quarters in the Vatican, the duke remained so close there for the few weeks that he abode in Rome on this occasion(1) that, from now onward, it became a matter of the utmost difficulty to obtain audience from him. This may have been due to his habit of turning night into day and day into night, whether at work or at play, which in fact was the excuse offered by the Pope to certain envoys sent to Cesare from Rimini, who were left to cool their heels about the Vatican ante-chambers for a fortnight without succeeding in obtaining an audience.