Hu Gadarn (English: Hu the Mighty) is a supposed Welsh legendary figure who appears in several of a series of Welsh Triads produced by the Welsh antiquarian and literary forger Iolo Morganwg. These triads, which Iolo put forth as medieval works, present Hu as a culture hero of the ancient Britons who introduced ploughing. However, it is now known that the triads, like all of the so-called "Third Series" of triads, were fabricated by Iolo himself. The name "Hu Gadarn" earlier appeared in a Welsh translation of a French romance about Charlemagne. Still, Iolo's version of Hu Gadarn was taken up in the 20th century by the poet Robert Graves, who associated him with other Celtic figures; since then he has been popular among neopagans.
Read more about Hu Gadarn: Origins, Iolo Morganwg and Later Use