Bartira (also known as M'bicy, Burtira or Isabel Dias; 1497–1580)[1] was the daughter of Tibiriçá, Chief of the Tupiniquim people of Piratininga and other tribes.
Bartira took the name Isabel Dias and married a Portuguese man, João Ramalho,[2] whose settlement became the nucleus of the modern Brazilian city of São Paulo.[3]
She and Ramalho had a number of children who married into prominent Portuguese/Brazilian families.