Prydain

Prydain is the medieval Welsh term for the island of Britain.

The peoples north of the Roman borders eventually came to be known as the Picts (Welsh: Brithwyr); the Welsh term for Pictland was Prydyn, which caused some confusion in the texts with Prydain.

It is in this context that the name of the collection of traditional material arranged in triads known as Trioedd Ynys Prydein should be understood.

[1] There are numerous other instances of the term Prydain in medieval Welsh texts.

One of the best known is found in the title of the 10th-century vaticinatory poem Armes Prydein ('The Prophecy of Britain').