Saints Aaron and Julius (or Julian) are two British saints who are traditionally held to have been martyred at Caerleon, Wales, during the Diocletianic Persecution of Christians in AD 304. Along with Saint Alban and Amphibalus, they are the only named martyrs from Roman Britain. Their feast day was traditionally celebrated on July 1 but is now observed together with St Alban on June 20 by both the Anglican and Catholic churches.