Alcyone

Alcyone is an ice sorceress who tutored under Clef and was brought up to attend to the Pillar. However, she fell in love with the high priest, Zagato, and for this love became his servant, although the affection is entirely one-sided.

Her name is occasionally misromanized as "Alcione"--this was featured in the first run of the English-language manga. Her name comes from the Subaru Alcyone SVX.

(Source: Wikipedia)