Don Quixote and Sancho Panza are tricked into using Clavileño, believing they have flown blindfolded and have controlled the horse with a peg in its head. The Dueña Dolorida (Countess Trifaldi) asserts that she and her ladies will be free of their charmed beards if knight and squire fly in the magical horse, send by the sorcerer Malambruno.
In Spanish, "peg" is clavija and "wood", leño, hence the name.
Clavileño is shown by some units of the Spanish Air Force in its badges.