The Hapsburg dynasty was fond of marriages of close relatives. It was a way to keep power within the family, especially with so many children in many generations. This chart shows one lineage: King Sebastian of Portugal had the normal four grandparents, but then because of the intermarriages, only four instead of eight great-grandparents and only six instead of sixteen great-great-grandparents.
People in this family tree:
- Infante Ferdinand, Duke of Viseu (1433 - 1470)
- Infanta Beatrice, Duchess of Viseu (1430 - 1506)
- Ferdinand II of Aragon (1452 - 1516)
- Queen Isabella of Spain (1451 - 1504)
- Maximilian I, Holy Roman Emperor (1459 - 1519)
- Mary of Burgundy (1457 - 1482)
- Manuel I of Portugal (1469 - 1521)
- Maria of Castile and Aragon (1482 - 1517)
- Joanna (Juana) of Castile and Aragon (1479 - 1555)
- Philip I of Castile (1478 - 1506)
- John III of Portugal (1502 - 1557)
- Isabella of Portugal (1503 - 1539)
- Catherine of Austria, Queen of Portugal (1507 - 1578)
- Charles V, Holy Roman Emperor (1500 - 1558)
- John Manuel, Prince of Portugal (1537 - 1554)
- Joan of Austria (1535 - 1573)
- Sebastian I of Portugal (1554 - 1578)
