Queen Mab is thought to be a degenerated (no, I mean this in a cultural way, not as a question of her character!) version of the Irish Queen
Medb, from the
Ulster Cycle. They share traits even aside from their names--both fierce queens of an otherworldly place (the Connacht of the Ulster Cycle is nothing if not fantastical), both incredably independant, both incredably sexual. Mab is said to have been married to
Oberon, and
Titiana's character may simply be a variation on Mab;
Titiana and
Oberon battled over who was more powerful, as did
Medb and her husband
Ailill.
Mab also appears in Peter Pan in Kensington Gardens.