The Welsh Triads (Welsh Trioedd Ynys Prydein, literally "Triads of the Island of Britain") are a group of related texts in medieval manuscripts which preserve fragments of Welsh folklore, mythology and traditional history in groups of three. The triad is a rhetorical form whereby objects are grouped together in threes, with a heading indicating the point of likeness. For example, "Three things not easily restrained, the flow of a torrent, the flight of an arrow, and the tongue of a fool".