Titania

Titania is a Faerie and the Summer Queen of the Summer Court. She is the daughter of Mother Summer, and mother of Aurora.

Biography
Titania is never actually met by Harry, appearing only once at the end of Summer Knight, being that Harry has more interaction with the Winter Sidhe. She is Mab's equal for the most part, the only difference in their power being who has control of the Stone Table at the time and who utilizes its power.