If, as Paul Remfry** suggests, the name Cynllibiwg means "the land of (St) Cynllo" then it could date from as early as the fifth to sixth century*, when Cynllo was active in mid-Wales, though, of course, it does not necessarily hold that the named Cynllo and Saint Cynllo are the same person. No records of St. Cynllo's life exist* to tell us whether he was once a local king (as, for example, in the case of Saint Meurig - see Wonder 11), held the land under tribute, or whether the land was simply named by actual or imagined association over a longer period of time. If one needs convincing the latter can occur, one only has to drive through modern western West Yorkshire, which is now ubiquitously signposted "Bronte Country". For a similar name, see Gwynllywg (extent), the territory of St.Cadoc's father/king St.Gwynllyw (life), which ran from "Ffynnon Hen to the mouth of the Rumney [Rhymney; Afon Elyrch]" (Bryce*, p.46, following Cadoc's life).