Editing Joanna of Castile (section)

===Princess of Asturias===
The death of Joanna's brother John, the stillbirth of John's daughter, and the deaths of Joanna's older sister Isabella and Isabella's son Miguel made Joanna heiress to the Spanish kingdoms. Her remaining siblings were Maria (1482–1517) and Catherine (1485–1536), younger than Joanna by three and six years respectively.

In 1502, the Castilian ''Cortes'' of Toro<ref name="Colmeiro">{{cite book|last=Colmeiro|first=Manuel|title=Cortes de los antiguos reinos de León y de Castilla|year=1883|publisher=Rivadeneyra| location=Madrid|url=https://archive.org/details/cortesdelosantigu02colm}}</ref>{{rp|36–69}}<ref name="moneda Juana">Francisco Olmos, ''Estudio documental de la moneda castellana de Juana la Loca fabricada''</ref>{{rp|303}} recognised Joanna as heiress to the Castilian throne and Philip as her consort. She was named [[Prince of Asturias|Princess of Asturias]], the title traditionally given to the heir of Castile.<ref name="Aram">Aram, Bethany. (1998) [https://www.jstor.org/stable/2544520 "Juana 'the Mad's' Signature: The Problem of Invoking Royal Authority, 1505–1507"] ''Sixteenth Century Journal,'' 29(2), 331–358. {{doi|10.2307/2544520}}</ref> Also in 1502, the [[Cortes of Aragon|Aragonese ''Cortes'']] gathered in [[Zaragoza]] to swear an oath to Joanna as heiress; however, the [[Archbishop of Zaragoza]], [[Alonso de Aragón]] expressed firmly that this oath could only establish [[jurisprudence]] by way of a formal agreement on the succession between the ''Cortes'' and the king.<ref name="moneda Carlos">Francisco Olmos,
''Estudio documental de la moneda castellana de Carlos I''</ref>{{rp|137}}<ref name="moneda Juana"/>{{rp|299}}

In 1502, Philip, Joanna and a large part of their court traveled to Toledo for Joanna to receive fealty from the Cortes of Castile as Princess of Asturias, heiress to the Castilian throne, a journey chronicled in great detail by [[Antoon I van Lalaing]] ({{langx|fr|link=no|Antoine de Lalaing}}). Philip and the majority of the court returned to the [[Low Countries]] in the following year, leaving a pregnant Joanna in [[Madrid]], where she gave birth to her fourth child, Ferdinand, later a central European monarch and [[Holy Roman Emperor]] as [[Ferdinand I, Holy Roman Emperor|Ferdinand I]].