Gwydion, the trickster protagonist of The Mabinogi, orchestrates the plot and manipulates those around him. His trickery ultimately results in political shifts, changes, and even wars, reflecting his role as a powerful player in the text. Moreover, Gwydion's use of poetry, knowledge, and words to enact his schemes and manipulations reflects the power of poets in medieval Welsh courts. My thesis argues that Gwydion's use of poetry to manipulate the politics around him reflects the power of poetry to craft nation states, as medieval Welsh poets did.