Cyclopedia of Biblical, Theological and Ecclesiastical Literature 
was originally a garment peculiar to Gaul, and introduced into Roman use by M. Aurelius Antoninus. Ecclesiastical writers (Bede, Hist. Eccl. lib. i, c. 7) speak of it as worn by clerics, and as corresponding in shape to the Jewish ephod. So says St. Eucherius of Lyons, about the 5th century, referring evidently to the genuine Gallic caracalla, which was a kind of short tunic with sleeves, and furnished with a hood. The caracalla introduced into use by M. Aurelius was, however, lengthened so as to reach nearly to the feet. From the reference to this garment by St. Jerome (Epistle to Fitbiola), it is likely that, in common with other garments for outdoor use, it was furnished with a hood.
The Nuttall Encyclopedia 
A Roman emperor, son of Septimius Severus, born at Lyons; his reign (211-217) was a series of crimes, follies, and extravagances; he put to death 20,000 persons, among others the jurist Papinianus, and was assassinated himself by one of his guards.