 As per tradition, they spent a night outside the walls of Rome before entering the city on 9 March, where Frederick and Pope Nicholas V exchanged friendly greetings.Because the emperor had been unable to retrieve the Iron Crown of Lombardy from the cathedral of Monza where it was kept, nor be crowned King of Italy by the archbishop of Milan (on account of Frederick's dispute with Francesco Sforza, lord of Milan), he convinced the pope to crown him as such with the German crown, which had been brought for the purpose.This coronation took place on the morning of 16 March, in spite of the protests of the Milanese ambassadors, and in the afternoon Frederick and Eleanor were married by the pope.