Juliana Dias da Costa

Donna Juliana Dias da Costa (1658–1733) was a woman of Portuguese descent from Kochi taken to the Mughal Empire's court of Aurangzeb in Hindustan, who became Harem-Queen to the Mughal emperor of India Bahadur Shah I, Aurangzeb's son, who became the monarch in the year 1707.

Dona Juliana's family fled the Dutch conquest of Portuguese Kochi (Cochin). She herself ended up in the Mughal court at Delhi, serving the family (wife and mother) of the then prince Shah’Alam. She continued to do so after the prince fell into disfavour with his father and accompanied him into exile. She was rewarded when Shah’Alam became Emperor (Shah) Bahadur I upon his father's death and her influence in the court became great, even though she remained a Catholic in a Muslim state. She is said to have ridden on a war elephant beside Bahadur Shah during his battles to defend his authority, and even after his death she continued to be highly considered, although with less influence.

During her period of strongest influence, while Bahadur Shah I was still alive, she was frequently sought out by European powers like the Dutch, Portuguese, the British, and the representatives of the Pope. She provided much assistance to the Society of Jesus, including helping the Italian Jesuit missionary Ippolito Desideri (1684-1733) in his mission to evangelise Tibet. In recognition of her many contributions and services to the Jesuits she was recognized as a Patroness of the Society.