E. Cobham Brewer 18101897. Dictionary of Phrase and Fable. 1898.
Wife of Oberon, king of the fairies. According to the belief in Shakespeares age, fairies were the same as the classic nymphs, the attendants of Diana. The queen of the fairies was therefore Diana herself, called Titania by Ovid (Metamorphoses, iii. 173). (Keightley: Fairy Mythology.)