Duke of Viseu

Duke of Viseu (in Portuguese Duque de Viseu) was a Portuguese Royal Dukedom created in 1415 by King John I of Portugal for his third male child, Henry the Navigator, following the conquest of Ceuta.

When Henry the Navigator died without issue, his nephew, Infante Ferdinand of Portugal (King Edward, King of Portugal's younger son), who was already Duke of Beja, inherited the Dukedom of Viseu and, when his younger son became King of Portugal as Manuel I, this became a royal Dukedom.

Following the establishment of the Portuguese Republic, the following individuals have claimed to be the Dukes of Viseu:

Coat of Arms of Prince Henry the Navigator , first Duke of Viseu.
Coat of Arms of Infante Ferdinand , 1st Duke of Beja and 2nd Duke of Viseu.