Thank you very much Candon for responding so swiftly. My muse has drawn my
mind to the name of a semi-fictional 2nd century king valled Tuathal
Teachtmhar and the writer of his Wikipedia bio states
"His name derives from Celtic *Teuto-valos ("leader of the tribe, people")
and his epithet may mean "great crossing", "great possession", or "legitimate".
What do you make of this Candon? Any ideas on this author's reasons for the
"great crossing..possession...legitimate" etymology?
A more precise question I wish to ask is who is the Irish Ri real enough to
trace back to and be confident lived. Who is the currently accepted one what
does his name mean?