Joanna la Beltraneja
Joanna of Castile, known as la Beltraneja (Juana la Beltraneja)
6 min read
Castilian princess, acknowledged daughter of King Henry IV of Castile, claimant to the throne upon his death in 1474. Her contested legitimacy triggered a war of succession that pitted her against her aunt Isabella the Catholic. Defeated, she withdrew to Portugal where she ended her days.
Frequently asked questions
Key Facts
- Born in 1462, the official daughter of **Henry IV of Castile** and **Joanna of Portugal**.
- Nicknamed “la Beltraneja” by her opponents, who claimed she was the daughter of the royal favorite **Beltrán de la Cueva**, casting doubt on her legitimacy.
- On the death of Henry IV in **1474**, she was proclaimed queen against her aunt **Isabella**, triggering the War of the Castilian Succession (**1475-1479**).
- Backed by King **Alfonso V of Portugal** (whom she married), she was defeated, notably at the Battle of Toro in **1476**.
- The Treaty of Alcáçovas (**1479**) sealed her defeat; she retired to a convent in Portugal, where she died in **1530**.
Works & Achievements
The first official act recognizing her right to the throne, sworn to by the kingdom's nobles — the foundation of her future claim.
A dynastic alliance meant to unite Portugal to her cause and open her path to the Castilian throne.
In the name of her legitimacy, she became the banner of a noble faction and of the Portuguese army against Isabella and Ferdinand.
For half a century she went on signing “Yo la Reina”, keeping alive the challenge to Isabella's legitimacy.
A choice imposed by the Treaty of Alcáçovas, which ended her active political career while symbolically preserving her dignity.
Anecdotes
Her nickname "la Beltraneja" comes from a court rumor: her opponents claimed she was not the daughter of King Henry IV — reputed to be incapable of having children and mocked under the nickname "the Impotent" — but rather the daughter of Beltrán de la Cueva, one of the sovereign's favorites. This accusation, never proven, was nevertheless enough to ruin her legitimacy in the eyes of part of the nobility.
At her birth in 1462, **Henry IV** had her solemnly recognized as heir by the Cortes of Castile, and the nobles swore allegiance to her. A few years later, those same nobles retracted their oath and pinned their hopes on the king's half-sister, **Isabella**.
To defend her rights, Joanna married her own uncle in 1475, **King Alfonso V of Portugal**, who was over forty years old while she was thirteen. The marriage required a dispensation from the pope because of their very close kinship.
After her defeat, Joanna withdrew to a convent in Portugal but never gave up her title: until her death, she signed her letters "Yo la Reina" — "I, the Queen" — thus defying **Isabella**, who reigned over Castile.
The conflict over her throne was settled in part by treaty: the text of Alcáçovas (1479) gave her the choice of marrying the future heir of Castile (Isabella's still-infant son) or entering a convent. She chose the cloister, sealing her aunt's victory.
Primary Sources
The king had Princess doña Juana, his daughter, sworn in as queen and heiress of his kingdoms, and all the grandees and prelates pledged obedience and loyalty to her.
Many held it for certain that the queen's daughter was not the king's, and from this came the name by which the people called her.
The king of Portugal entered Castile with his army to defend the cause of doña Juana, whom he had taken as his wife.
It is agreed that doña Juana shall enter religious life in a monastery, or else that she shall wait to marry the heir-apparent of Castile.
Key Places
City in Castile where Joanna was born in 1462 and was first recognized as heir to the throne.
Site of the 1468 pact where Henry IV recognized his half-sister Isabella as heir, removing Joanna from the succession.
Scene in 1476 of the decisive battle of the War of Succession, exploited as a victory by Isabella's camp.
Portuguese town where the treaty ending the war and sealing Joanna's withdrawal was signed in 1479.
Portuguese convent where Joanna retired from 1480 onward, without renouncing her title of queen.
Portuguese capital where Joanna spent the end of her life and died in 1530.
