AARON and JULIUS (Saints), suffered martyrdom together, during the persecution under the emperor Diocletian, in the year 303, about the same time with Saint Alban the protomartyr of Britain. We are nowhere 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. They had each a church erected to his memory; and their festival is placed, in the Roman martyrology, on the fifth of July.

or Harun, Al Raschid, a celebrated khalif, or Mahometan sovereign of the Saracen empire; whose history is given under the article BAGDAD.

AARON Harischon, a learned rabbi and CARAITE in the 15th century, wrote an Hebrew grammar, printed at Constantinople in 1581; probably the same with Aaron the caraite, who wrote a commentary on the five books of Moses, which is in MS. in the French king's library.