Alcyone is one of the main stars of the Pleiades cluster. Its official astronomical designation is Eta Taurus, and it's approximately 407.4 LY away.
Some Mayan legends refer to Alcyone as the 'Great Central Sun' around which our solar system would rotate. (But note that this last part, about our solar system rotating around Alcyone has been proven incorrect).
Alex Collier claims that a break-away faction of Pleiadians with hidden agendas would come from the Alcyone system.