Which preposition to use with piacenza

on Occurrences 1%

The next morning at eleven o'clock we arrived at Piacenza on the Po, and were detained a quarter of an hour at the Douane of Her Majesty the Archduchess, as Maria Louisa, the present Duchess of Parma, is stiled, we being now arrived in her dominions.

to Occurrences 1%

France generously restored all her conquests, without claiming other advantages beyond the assurance of the duchies of Parma and Piacenza to the Infante Don Philip, son-in-law of Louis XV.

without Occurrences 1%

Less than three months after the victory of Ravenna the triumphant allies had re-taken Bologna, Parma, and Piacenza without a blow; had encouraged Genoa to assert her independence; and Italy, with the exception of a few citadels, had escaped from French rule.

Which preposition to use with  piacenza