Liber Pontificalis
Harnack suggests that in the document which the compiler of the "Liber Pontificalis" drew his information, the name found was not ', but '. Now this is the name (', ') of the fortress of Edessa. The king in question is, therefore, Lucius Ælius Septimus Megas Abgar IX, of Edessa, a Christian king as is well known. The original statement of the "Liber Pontificalis", in this hypothesis, had nothing to do with Britain; the compiler of the "Liber Pontificalis" changed ' to ', and in this way made a British king of the Syrian Lucius.