Early in the year the crown prince Humbert with the Princess Margherita took up their residence in the Quirinal Palace, which, in view of the Vatican refusal to deliver up the keys, had to be opened by force.
From early times he was worshipped at Rome on the Quirinal hill, whither, according to tradition, a body of Sabines under Titus Tatius had migrated from Cures and taken up their abode.
Consequently relations between France and Italy became so strained that in 1873 both the French minister to the Quirinal and the Italian minister to the Republic remained for several months absent from their posts.
The improvement thus signalized in the relations between Quirinal and Vatican was further exemplified on the 18th of October 1878, when the Italian government accepted a papal formula with regard to the granting of the royal exequatur for bishops, whereby they, upon nomination by the Holy See, recognized state control over, and made application for, the payment of their temporalities.
Among his noteworthy achievements are the reform of the calendar on the 24th of February 1582 (see Calendar); the improved edition of the Corpus juris canonici, 1582; the splendid Gregorian Chapel in St Peter's; the fountains of the Piazza Navona; the Quirinal Palace; and many other public works.