Pope Sixtus IV (1471–1484) had already made an alliance with the Swiss Confederacy and built barracks in Via Pellegrino after foreseeing the possibility of recruiting Swiss mercenaries.
Paus Siktus IV (1471-1484) sebelumnya telah membuat aliansi dengan Konfederasi Swiss and membangun banyak barak di Via Pellegrino setelah memprediksi kemungkinan menggunakan jasa tentara bayaran Swiss.