Gregorio Allegri was a Catholic priest and Italian composer of the Roman School and brother of Domenico Allegri; he was also a singer. He was born and died in Rome. He is chiefly known for his Miserere for two choirs.

In music history, the Roman School was a group of composers of predominantly church music, in Rome, during the 16th and 17th centuries, therefore spanning the late Renaissance and early Baroque eras. The term also refers to the music they produced. Many of the composers had a direct connection to the Vatican and the papal chapel, though they worked at several churches; stylistically they are often contrasted with the Venetian School of composers, a concurrent movement which was much more progressive. By far the most famous composer of the Roman School is Giovanni Pierluigi da Palestrina, whose name has been associated for four hundred years with smooth, clear, polyphonic perfection. However, there were other composers working in Rome, and in a variety of styles and forms.