He was born on February 8, 1634 in Vila Viçosa and was the heir to the throne of Portugal since then until his death at only 19 years of age.

When the prince was 16 years old he took part in the State Council's reunions.

D. Teodósio's death, on May 13, 1653 caused great unrest in the kingdom.
His next brother, the medically and mentally problem-ridden Infante Afonso, succeeded him as Prince of Brazil, Duke of Braganza and heir-apparent of the kingdom.
Due to mental incapacity and impotence, Afonso would eventually be deposed by Pedro, Duke of Beja and died childless.
He was born on February 8, 1634 in Vila Viçosa and was the heir to the throne of Portugal since then until his death at only 19 years of age.
When the prince was 16 years old he took part in the State Council's reunions.
D. Teodósio's death, on May 13, 1653 caused great unrest in the kingdom. His next brother, the medically and mentally problem-ridden Infante Afonso, succeeded him as Prince of Brazil, Duke of Braganza and heir-apparent of the kingdom. Due to mental incapacity and impotence, Afonso would eventually be deposed by Pedro, Duke of Beja and died childless.
Teodósio, Prince of Brazil