Which preposition to use with franchi

of Occurrences 2%

The double Napoleon of forty franchi of the Kingdom of Italy is a beautiful coin; on the run are the words, Dio protegge l'Italia.

as Occurrences 1%

In return, his friend, who was just setting off for Mexico, commended his wife, Emilie, whom he adored and trusted absolutely, to his care, and asked his wife to consider Louis de Franchi as her brother.

on Occurrences 1%

Count Malatesta slapped Franchi on the back.

Which preposition to use with  franchi