The smallest and central island of the Cyclades, the birthplace of Apollo and Artemis, and where the former had a famous oracle; it was, according to the Greek mythology, a floating island, and was first fixed to the spot by Zeus to provide Leda with a place, denied her elsewhere by Hera, in which to bring forth her twin offspring; it was at one time a centre of Apollo worship, but is now uninhabited, and only frequented at times by shepherds with their flocks.