Urgent research in the libraragh c'heltic in La Baule brings fort the following ancient fragment, described as "an anthem by the Celts in praise of the Establishment". i put this together with Prof. Coquisod's Glossary of the Ancient Breton which almost appears to fit.

The fragment

rhul brhetainach
brhetainach rulder whaiv
brhetainc nhev a nev achneivach
challbe chlaifth


Glossary

achneivach = achieve - to have something done to
brhetainach = (those) of the state of Britain - the government or establishment of the land and / or its policies
challbe    = until it is
chlaifth    = wounded - sore - injured (in the sense of being destroyed or rendered permanently useless)
nhev       = shall have
nev         = shall have repeatedly
rhul       = to ream, push or pull roughly (eg through a small orifice or opening)
rhulder    = the act of reaming - shall be reamed, etc ...
whaiv       = endpiece