- Pope Pius XII
- Queen Amélie of Orléans
From 1957 to 1959, Dom Duarte was enrolled in the Colégio Nun'Álvres in Santo Tirso, Portugal. In 1960, he attended Colégio Militar. He also attended Instituto Superior de Agronomia, and later attended the University of Geneva
In the late 1960s and early 1970s, he fufilled his military service seriving as a helicopter pilot in the Portuguese Air Force.
On 13 May 1995, he married Isabel Inês de Castro Curvelo de Herédia. Together, they have three children:
- Infante Afonso de Santa Maria de Bragança of Portugal, Prince of Beira, Duke of Barcelos (b. 1996)
- Infanta Maria Francisca of Portugal (b. 1997)
- Infante Dinis de Santa Maria de Bragança of Portugal, Duke of Porto (b. 1999)