[1] Giacomo Bosio arrived at Rome in 1587 and was appointed representative of the Hospitaller Order of the Holy See to the cardinal Gregorio Petrocchini.

He took advantage of his stay in Rome to write the history of his order, under the title Dell'istoria della Sacra Religione, Giovanni di Santo dell'illustrissima milizia Gierosolimitano.

Bosio's work deals with the history of the Hospitallers order from its origin until 1571 with Jean Parisot de la Valette.

His story was continued by brother Bartolomeo dal Pozzo up to the year 1688 and first published in Verona in 1703 in two volumes, then in Venice in 1740 under the title Historia della Sacra di religione militare S. Giovanni Gerosolimitano, della Malta.

Bosio's history was translated into French by Pierre de Boissat, augmented by Jean Baudoin.