unknown, as is the case with much material in his Historia. Many of the figures associated with him, such as the kings who side with him, appear to be based on figures from Geoffrey's own era. Geoffrey Ashe theorizes that he was originally Glycerius, whose name was known to have been misspelled as "Lucerius" in texts prior to the writing of the Historia, and was further misspelled by Geoffrey of Monmouth as "Lucius Tiberius/Hiberius". Another theory, proposed by Roger Sherman Loomis, suggests that Lucius is a reflex of the god Lugh, under the name "Llwch Hibernus", which could change into "Lucius Hiber(i)us". Though there are passages in Geoffrey's work that give him the title "Emperor", he is apparently acting for Emperor Leo. In most post-Geoffrey versions, however, Lucius himself holds the position of Emperor and Leo is omitted. It is also possible that Geoffrey actually meant the historical Emperor Leo, a late 5th-century leader of the Eastern Roman Empire, as just an ally of the Western Romans. Lucius is referred to as both Tiberius and Hiberius in Geoffrey of Monmouth. Hiberius is a name meaning "Spanish", and Lucius is explicitly called Spanish in one of the earliest adaptations from Geoffrey, Wace's Roman de Brut. It is also from Wace onwards that Leo is excised from the text and only Lucius himself is referred to as Emperor, and in the Alliterative Morte Arthure Leo appears as merely a subordinate of Lucius. References Lucius Tiberius Legendary Romans Lucius Tiberius