In an Irish poem relating to the Kingdom of the Isles, copied from a fragment of an Irish M.S. written about A.D. 1600 in the possession of W.M. Hennessy, collated with a copy contained in the Book of Fermoy transcribed about A.D. 1457, we find this:-

A Radhnaill a ri Cola
Gach ni ad ghlanluing do gheabha
Rug ar shluagh sniomh an mhara
Fion tona fhuar na heala.

Or, in translation: -

Oh Raghnall, oh King of Coll,
All things in thy fair ship thou'lt find
Which to the host has the winding sea brought,
The thin cold wine of the swans.

Reginald, a son of Somerled, ruled over part of the Isles from 1164 to 1204. Also there was Reginald, son of Godred, Norwegian King of the Isles from 1188 to 1266.