Analysis of information sources in references of the Wikipedia article "Celtic harp" in English language version.
A self-accompanying poet like Dafydd ap Gwilym would have used a small, portable harp, perhaps a form of the telyn raun (or rawn)...This horsehair-strung instrument remained prevalent in the Welsh bardic context until at least the seventeenth century...Other types of harp were nevertheless known in Wales, including the metal-strung harp used by the Irish...Gut strings were the norm elsewhere in Europe and England, but apparently despised in Wales, at least by some...
What does 'Clera' mean? It is not an acronym! It's an old Welsh word for the wandering minstrels - musicians and poets - of times gone by. Clerwr would be the minstrel himself (plural clerwyr); clera is the verb [to harp].