 "Hedd Wyn, Ei Farddoniaeth", a complete Welsh language anthology of his works, was published by Trawsfynydd's Merilang Press in 2012.The poem "Yr Arwr" ("The Hero"), for which Hedd Wyn won the National Eisteddfodd, is still considered his greatest work.The ode is structured in four parts and presents two principal characters, "Merch y Drycinoedd" ("Daughter of the Tempests") and the "Arwr".