The Welsh Triads are otherwise known as the Triads of the Island of Britain (Britain is also referred to as Prydain).
The word Triads is gotten from the word “Tri” which means three. In literature the Triad is a rhetorical form whereby Items/ objects are grouped together in threes, with a heading or title that shows the point of similarity. For instance “Three things cannot be controlled; the speed of light; the flow of a torrent; and the tongue of a fool.”