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Apparently these are the heirs of Catherine of Navarre

Anne of Navarre (19 May 1492 – 15 August 1532). according to this website married to John of Foix-Candale, comte d'Astarac, a nephew of Anne of Foix-Candale.

Magdalena of Navarre (29 March 1494 – May 1504).
Catherine of Navarre (1495 – November 1532). Abbess of the Trinity at Caen.
Joan of Navarre (15 June 1496 – last mentioned in November, 1496).
Quiteria of Navarre (1499 – September/October 1536). Abbess at Montivilliers.
A stillborn son in 1500.
Andrew Phoebus of Navarre (14 October 1501 – 17 April 1503).
Henry II of Navarre (18 April 1503 – 25 May 1555).[4]
Buenaventura of Navarre (14 July 1505 – 1510/1511).
Martin of Navarre (c. 1506 – last mentioned in 1512).
Francis of Navarre (1508 – last mentioned in 1512).
Charles of Navarre (12 December 1510 – September 1528). Took part in the Siege of Naples during the War of the League of Cognac but was captured. Died while still held as a prisoner of war.
Isabella of Navarre (1513/1514 – last mentioned in 1555). Married Rene I, Viscount of Rohan.



I was thinking what if Anne of Navarre was able to have children from her husband, her children would be related to the Austrian Habsburgs via Anne of Foix-Candale, if Henry II of Navarre dies childless the Navarrese line passes to a family very much related to the Austrian Habsburgs..
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