Asteria

Asteria In Mythology
Asteria was the Greek Titan goddess associated with oracles, prophecy, and necromancy. Her husband was Perses, god of destruction, and her daughter was Hekate. Greek myth tells of how to escape the advances of Zeus, she flung herself into the Aegian Sea and became an island. She would later serve as a safe haven for her sister Titan, Leto, when she gave birth to her twins, Apollo and Artemis.

The Secrets of the Immortal Nicholas Flamel
Asteria is briefly referenced in the Alchemyst, where she is referred to by Nicholas Flamel as the mother of Hekate.