Llywarch Llaety was a Welsh language

Welsh language

Welsh is a member of the Brythonic branch of the Celtic languages spoken natively in Wales, by some along the Welsh border in England, and in Y Wladfa...

 court poet.

A single poem by Llywarch survives, the earliest text of which is found in the Hendregadredd manuscript

Hendregadredd manuscript

The Hendregadredd Manuscript , is a medieval Welsh manuscript containing an anthology of the poetry of the "Poets of the Princes"; it was written during the period between 1282 and 1350...

, in praise of Llywelyn ap Madog, son and heir of prince Madog ap Maredudd

Madog ap Maredudd

Madog ap Maredudd was the last Prince of the entire Kingdom of Powys, Wales and for a time held the Fitzalan Lordship of Oswestry.Madog was the son of Maredudd ap Bleddyn and grandson of Bleddyn ap Cynfyn. He followed his father on the throne of Powys in 1132...

 of Powys.

It is possible that Llywarch Llaety is the same person as the poet Llywarch y Nam who also composed a poem in honour of Llywelyn ap Madog.