Maria d'Aquino (died in 1382) was a Neapolitan noblewoman who is traditionally identified with Giovanni Boccaccio's beloved and muse Fiammetta (Italian for "little flame").
Maria d'Aquino was a royal bastard, an illegitimate daughter of Robert the Wise, King of Naples and Count of Provence. She was an accomplice in the 1345 murder of King Andrew, the husband of her niece and Robert's successor, Queen Joanna I. For this Maria was sentenced to death and beheaded in 1382 on the orders of Queen Joanna I's successor, King Charles III.
Boccaccio wrote about Maria d'Aquino and their relationship in several of his literary works. She is traditionally identified as Fiammetta According to him, Maria's mother was a Provençal noblewoman, Sibila Sabran, wife of Count Thomas IV of Aquino. She was born after Countess Sibila and King Robert commited adultery at his coronation festivities in 1310, but was given the family name of her mother's husband. Her putative father placed her in a convent
Fiammetta appears in the following works by Boccaccio: