Tartaro, Tartalo, or Torto in Basque mythology, is an enormously strong one-eyed giant very similar to the Greek Cyclops that Odysseus faced in Homer's Odyssey. He is said to live in caves in the mountains and catches young people in order to eat them; in some accounts he eats sheep also.
Alarabi is another name for the creature. Anxo (or Ancho) may also be equivalent, but some sources say this is another name for the Basajaun.