Santos, Domitila de Castro Canto e Melo, viscountess, then marchioness of (São Paulo, 1797 - id. 1867). Favourite of Peter I of Brazil.

The Regent of Brazil first met D. Domitila in 1822 during his travel through São Paulo which would lead to the Brazilian Independence. She was married to Felício Muniz, a military officer of low rank. Crowned emperor, Peter I invited her to move to Rio de Janeiro and offered her an office at the Court, placing her at the Empress's entourage as her lady in waiting. There she managed to have her first marriage nullified.

The emperor proved himself very generous when it came to honour his favourite and her family aswell (her sister was made Baroness of Sorocaba and eventually joined the extensive roll of royal mistresses). He did not hesitate in bestowing titles on their three daughters (the duchesses of Goiás and Ceará and the countess of Iguaçu) and having them educated with the royal princesses.

When D. Leopoldina, the empress, died due to complications caused by an abortion the public opinion held the marchioness responsible for the grievances and humiliations put through by the first. Marrying D. Domitila was out of question. Peter sent an ambassador to Europe to find him a new wife. His reputation as a bad husband made the Baron of Barbacena's errand very difficult though. Not only was Peter a womanizer and rather poor, but the South American emperor was also said to be violent according to rumours arisen after the dramatic death of D. Leopoldina.

In 1829, when Peter married for the second time the young bavarian princess Amelie of Leuchtemberg (to the marchioness's great dismay), D. Domitila (pregnant with the fourth child by D. Pedro) was dismissed, returning to São Paulo. There she married again the brigadier Rafael Tobias de Aguiar.