Joanna I of Castile

Definition and stakes

A. H. Johnson Europe in the Sixteenth Century…

At the close of the Neapolitan war, the alliance between the houses of Hapsburg and Spain, based on the marriage of the Archduke Philip, son of Maximilian, with Joanna, the daughter of Ferdinand of Aragon and Isabella of Castile, threatened to break up. By the deaths in 1497, and 1500, of John, the eldest son, and of Michael of Portugal, the grandson of the Spanish monarchs, Joanna became the heiress of Castile and Aragon,21 and, in the event of Isabella’s death, would become Queen of Castile to the exclusion of her father.
Source: Gutenberg

1911 Encyclopædia Britannica (1911)

Her youngest sister was Catherine of Aragon, the first wife of Henry VIII. In 1496 at Lille she was married to the archduke Philip the Handsome, son of the German King Maximilian I., and at Ghent, in February 1500, she gave birth to the future emperor. The death of her only brother John, of her eldest sister Isabella, queen of Portugal, and then of the latter’s infant son Miguel, made Joanna heiress of the Spanish kingdoms, and in 1502 the cortes of Castile and of Aragon recognized her and her husband as their future sovereigns. Soon after this Joanna’s reason began to give way.
Source: Wikisource

Ierne L. Plunket Isabel of Castile and the making of the Spanish nation… (1915)

The birth of her son, Ferdinand, in March, 1452, set fire to the slumbering jealousy she had conceived 27for Charles of Viana, and henceforth she devoted her talents and energy to removing him from her path.
It is the penalty of public characters that their private life is not only exposed to the limelight, but its disagreements involve the interference of many who are not directly concerned. The hatred of Queen Joanna for her stepson not only convulsed Navarre and Aragon but dragged Castile also into the scandal.
Source: Gutenberg

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