Gaston, Prince of Viana, also called Gaston de Foix (1444 – 23 November 1470, Libourne

Libourne

Libourne is a commune in the Gironde department in Aquitaine in southwestern France. It is a sub-prefecture of the department.It is the wine-making capital of northern Gironde and lies near Saint-Émilion and Pomerol.-Geography:...

, Aquitaine

Aquitaine

Aquitaine , archaic Guyenne/Guienne , is one of the 27 regions of France, in the south-western part of metropolitan France, along the Atlantic Ocean and the Pyrenees mountain range on the border with Spain. It comprises the 5 departments of Dordogne, :Lot et Garonne, :Pyrénées-Atlantiques, Landes...

), was the son of Gaston IV of Foix and Eleanor of Navarre

Eleanor of Navarre

Eleanor of Aragon , Regent and the queen regnant of Navarre in 1479...

, and was the heir of both. As a Prince of Navarre, he was called Prince of Viana.

He married Magdalena of Valois

Magdalena of Valois

Magdalena of Valois, also called Madeleine de France , was a daughter of Charles VII of France and Marie of Anjou, and acted as regent for her children, Francis I and Catherine I, who were successively monarchs of Navarre.Magdalena was betrothed to Ladislaus the Posthumous however he died suddenly...

, a daughter of Charles VII of France

Charles VII of France

Charles VII , called the Victorious or the Well-Served , was King of France from 1422 to his death, though he was initially opposed by Henry VI of England, whose Regent, the Duke of Bedford, ruled much of France including the capital, Paris...

 and Marie of Anjou

Marie of Anjou

Marie of Anjou was the Queen consort of King Charles VII of France from 1422 to 1461. Her mother, Yolande of Aragon, played a leading role in the last phase of the Hundred Years' War.-Family:...

 on 7 March 1461 at Lescar

Lescar

Lescar is a commune in the Pyrénées-Atlantiques department in south-western France.Lescar is the site of the Roman city known variously as Benearnum, Beneharnum or Civitas Benarnensium. This was the original capital, and origin of the name, of the ancient province of Béarn.In 841, Benearnum was...

. They had two children:

• Francis I of Navarre
  Francis I of Navarre
  Francis Phoebus of Foix was king of Navarre and count of Foix . He was the son of Gaston de Foix, Prince of Viana, and grandson of Eleanor of Navarre, whom he succeeded.During his brief reign, he was the charge of his mother, the regent, Magdalena of Valois...
  
  , 1466–1483, King of Navarre 1479–1483
• Catherine I of Navarre, 1470–1518, Queen-regnant of Navarre 1483–1518

Gaston died from wounds received in a jousting tournament in Libourne, Aquitaine, in 1470.