Mari, also called Mari Urraca, Anbotoko Mari ("the lady of Anboto"), and Murumendiko Dama ("lady of Murumendi") was a goddess—a lamia—of the Basques. She was married to the god Sugaar (also known as Sugoi or Maju). Legends connect her to the weather: when she and Maju travelled together hail would fall, her departures from her cave would be accompanied by storms or droughts, and which cave she lived in at different times would determine dry or wet weather: wet when she was in Anboto; dry when she was elsewhere (the details vary). Other places where she was said to dwell include the chasm of Murumendi, the cave of Gurutzegorri (Ataun), Aizkorri and Aralar, although it is not always possible to be certain which Basque legends should be considered to pertain to the same lamia.
It is believed that Mari is a modification of Emari (gift) or Amari (mother + the suffix of profession) by losing the first vowel. The closeness in names between Mary and Mari may have helped pagans adapt their worship of Mari to undertake Christian veneration of the Virgin Mary. The first known written citation of the "Dame of Amboto" was made by Charles V's chronicler Esteban de Garibay Zamalloa in his Memorial histórico español.
Mari lives underground, normally in a cave in a high mountain, where she and her consort Sugaar meet every Friday (the night of the Akelarre or witch-meeting) to conceive the storms that will bring fertility (and sometimes disgrace) to the land and the people. Mari is served by a court of sorginak (witches), and is said to feed "on the negation and affirmation" (that is, on falsehood).