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In 1462 Henry IV's wife gave birth to a daughter, Juana. Was Henry IV her father? The king's enemies were subsequently to allege that he was impotent and that Juana was the fruit of an adulterous relationship between the queen and Beltran de la Cueva. Eventually such allegations helped to support the claims of Isabella to the throne of Castile at Henry IV's death in 1474. But although the succession was resolved by force of arms, historians have occasionally been preoccupied with the problem of whether Isabella usurped the throne from Juana. Attempts to resolve this problem inevitably lead back to the enigmatic figure of Henry IV. Was he in fact Juana's father? Was he impotent, as his enemies alleged? Can the evidence which has survived be used to formulate a medical diagnosis whichk might help to resolve the mystehes both with regard to Henry IV himself and the related problem of the 'legality' of the succession?

Diagnóstico médico de Enrique IV de Castilla