Which preposition to use with pubblico

at Occurrences 3%

On the walls of the Palazzo Pubblico at Siena were painted the figures of Curius Dentatus and Cato, while the pavement of the Duomo showed Hermes Trismegistus instructing both a pagan and a Christian, and Socrates ascending the steep hill of virtue.

of Occurrences 2%

These are the Palazzo Pubblico of Siena and the Palazzo Vecchio of Florence.

Which preposition to use with  pubblico