The Medal Pro Petri Sede, also referred to as Castelfidardo Medal, was a decoration for military merit bestowed by the Holy See in the Second Italian War of Independence during the Italian unification.

The medal was instituted by Pope Pius IX on 12 November 1860 after the defeat of the Papal troops in the Battle of Castelfidardo.

[1] It was not limited to the Battle of Castelfidardo and given to the participants of the campaign.

The inscription is VICTORIA, QUAE VICIT MUNDUM, FIDES NOSTRA On the obverse side of the medal the inscription is PRO PETRI SEDE, PIO IX P. M. A. XV (transl.

The medal is suspended from a red ribbon with two narrow white stripes edged in yellow.