Duke of Viseu was a Portuguese

Portugal

Portugal , officially the Portuguese Republic is a country situated in southwestern Europe on the Iberian Peninsula. Portugal is the westernmost country of Europe, and is bordered by the Atlantic Ocean to the West and South and by Spain to the North and East. The Atlantic archipelagos of the...

 Royal Dukedom created in 1415 by King John I of Portugal

John I of Portugal

John I KG , called the Good or of Happy Memory, more rarely and outside Portugal the Bastard, was the tenth King of Portugal and the Algarve and the first to use the title Lord of Ceuta...

 for his third male child, Prince

Prince

Prince is a general term for a ruler, monarch or member of a monarch's or former monarch's family, and is a hereditary title in the nobility of some European states. The feminine equivalent is a princess...

 Henry the Navigator, following the conquest of Ceuta

Ceuta

Ceuta is an autonomous city of Spain and an exclave located on the north coast of North Africa surrounded by Morocco. Separated from the Iberian peninsula by the Strait of Gibraltar, Ceuta lies on the border of the Mediterranean Sea and the Atlantic Ocean. Ceuta along with the other Spanish...

.

When Prince

Prince

Prince is a general term for a ruler, monarch or member of a monarch's or former monarch's family, and is a hereditary title in the nobility of some European states. The feminine equivalent is a princess...

 Henry the Navigator died without issue, his nephew, Infante Ferdinand of Portugal

Infante Fernando, Duke of Viseu

The Infante Ferdinand, Prince of Portugal, Duke of Beja and Duke of Viseu was the third son of the Portuguese King Edward of Portugal and his wife Eleanor of Aragon.- Biography :...

 (King Edward of Portugal's younger son), who was already Duke of Beja

Duke of Beja

Duke of Beja was an aristocratic Portuguese title with the level of Royal Dukedom, associated with the Portuguese Royal House, created in 1453, by King Afonso V of Portugal for his younger brother Infante Ferdinand of Portugal.Infante Ferdinand younger son, became King of Portugal as Manuel I and,...

, inherited the Dukedom of Viseu and, when his younger son became King of Portugal as Manuel I

Manuel I of Portugal

Manuel I , the Fortunate , 14th king of Portugal and the Algarves was the son of Infante Ferdinand, Duke of Viseu, , by his wife, Infanta Beatrice of Portugal...

, this became a royal Dukedom.

List of the Dukes of Viseu

1. Henry the Navigator, Prince of Portugal (1394-1460)
2. Ferdinand of Portugal
   Infante Fernando, Duke of Viseu
   The Infante Ferdinand, Prince of Portugal, Duke of Beja and Duke of Viseu was the third son of the Portuguese King Edward of Portugal and his wife Eleanor of Aragon.- Biography :...
   
   , 1st Duke of Beja (1433-1470)
3. John of Viseu
   John, Duke of Viseu
   Infante John of Viseu was the older son of Infante Fernando, Duke of Viseu and of his wife Infanta Beatrice of Portugal....
   
   , 2nd Duke of Beja (1448-1472)
4. Diogo of Viseu
   Diogo, Duke of Viseu
   Infante Diogo of Viseu was the second son of Infante Fernando, Duke of Viseu, and his wife Beatriz of Portugal.In 1472, when his older brother John, Duke of Viseu, died without issue, Diogo inherited his titles and estates as 4th Duke of Viseu and 3rd Duke of Beja.Diogo was a popular personality...
   
   , 3rd Duke de Beja (1450-1484)
5. King Manuel I of Portugal
   Manuel I of Portugal
   Manuel I , the Fortunate , 14th king of Portugal and the Algarves was the son of Infante Ferdinand, Duke of Viseu, , by his wife, Infanta Beatrice of Portugal...
   
    (1469-1521)
6. Infanta Maria of Portugal
7. Prince Miguel of Braganza
   Prince Miguel of Braganza
   Prince Miguel of Braganza, Duke of Viseu was a member of the exiled branch of the House of Braganza. The eldest son of the Miguelist pretender to the throne of Portugal he married an American heiress in 1909 and in 1920 renounced his rights to the throne...
   
    (1878-1923)
8. Infante Miguel, Duke of Viseu
   Infante Miguel, Duke of Viseu
   The Infante Miguel, Duke of Viseu is the second son of Duarte Nuno, Duke of Braganza and his wife Princess Maria Francisca of Orleans-Braganza...
   
    (born 1946) (brother of Duarte Pio, Duke of Braganza
   Duarte Pio, Duke of Braganza
   Dom Duarte Pio, Duke of Braganza , is the 24th Duke of Braganza and a pretender to the throne of Portugal.-Birth and education:...
   
   )

External links

• Genealogy of the Dukes of Viseu - Portuguese Genealogical site