List of Kings of Lyonesse (Fidem Pacis)

Syagrian Dynasty
Prior to Aegidius' appointment as magister militum per Gallias by the Emperor Majorian, the territory of Lyonesse was a part of the Western Roman Empire proper. For its rulers then, see List of Roman emperors and Praetorian Prefecture of Gaul.

Merovingian Dynasty
Merovingian rule over Lyonesse effectively ended with the death of King Dagobert at the Battle of Castras and the dismemberment of his realm. Clovis II was overthrown a few years later by the Visigoths and fled to the Frankish homeland.