AARON, Pietro, a Florentine monk of the sixteenth century, an elaborate writer on music. His chief works, which are curious, are Il Toscanello della Musica, and Elucidario in Musica di Alcune Oppenioni Antiche e Moderne. Venice, 1545, 4to.
AARON and JULIUS, Saints, were brothers who suffered martyrdom together, during the persecution under the emperor Diocletian, in the year 303, about the same time with St Alban, the first martyr of Britain. We are not told what their British names were, it being usual with the Christian Britons, at the time of baptism, to take new names from the Greek, Latin, or Hebrew. Nor have we any certainty as to the particulars of their death; only that they suffered the most cruel torments. Two churches were dedicated to the brothers, in which their bodies were interred, at Caer-Leon, the ancient metropolis of Wales.