It is located in a park, the Piazza delle XIII Vittime, at the intersection of Via Cavour and Via Francesco Crispi, just north of the church of San Giorgio dei Genovesi in the ancient quarter of Castellammare of Palermo, region of Sicily, Italy.
With the aid of some of the Franciscans, some thirty conspirators had hidden themselves and weapons in the Gancia convent, but were betrayed to the police by one of the friars, Michele da Sant’Antonino.
The head of police, Salvatore Maniscalco, gathered a regiment an on 4 April 1860 stormed the convent killing nearly twenty and capturing thirteen rebels.
Two were able to escape by hiding amid corpses in the crypt tombs, and later tunneling out through a small perforation in the wall (bucca della salvezza) still marked on Via Allora.
At the base are engraved the names of the victims: Michelangelo Barone (age 30 years), Gaetano Calandra (34), Sebastiano Camarrone (30), Cono Cangeri (34), Andrea Coffaro (60), Domenico Cucinotta (31), Nicolò Di Lorenzo (32), Giovanni Riso (58), Liborio Vallone (44), Pietro Vassallo (40), Francesco Ventimiglia (27), Michele Fanara (22), and Giuseppe Teresi (28 years old).