Erecting the stone of Ketti. Constructing the work of Emrys. And heaping the pile of Cyvrangon.
The three happy astronomers. (Serenyddion, Suronides) of the Island of Britain. Idris Gawr. Gwyddion the son of the Don. And Gwyn the son of Nudd.
So great was their knowledge of the stars, and of their nature and situations, that they could foretell whatever might be desired to be known to the day of doom.
XVI. The three masters of mysterious and secret science, of the Island of Britain.
Math, the son of Mothanwy, and he disclosed his secret to Gwyndion the son of Don.
Mengw, the son of Teiagmaedd, who taught his secret to Uthyr Bendragon.
And Rhuddlwm Gawr, and he learned his mystery of Eddic Gor and Coll, the son of Coll Frewi.
XVII. The three great modellers of the Island of Britain.
Corvinwr, the Bard of Ceri Hir of Llyngwyn, who first made a ship, with a sail and a helm, for the race of the Cymry.
Mozdial Gwr Gweilgi, the architect of Ceraint, the son of Greidial, who first taught the race of the Cymry, the work of stone and lime, [at the time Alexander the Great was subduing the world.]