Andrea Gallerani († 19 March 1251) was an Italian Roman Catholic from Siena and the founder of the now-defunct Frati della Misericordia association.

[1] Gallerani was a distinguished soldier until he killed a man he considered a blasphemer in a fit of rage.

In his exile he experienced a radical shift in tone that compelled him to lead a penitential life for others.

In 1274 the bishop granted indulgences to those that visited his tomb and Pope Pius V later reinforced this to a specific date in the week following Easter.

[2] On 13 May 1798 after his exile from Rome, and while stopping in Florence, Pope Pius VI approved the beatification of Gallerani.