Charles's mother, Mariana of Austria, herself a Habsburg, was a niece of his father, Philip. Mariana was a daughter of Empress Maria Anna of Spain (1606–46) and Emperor Ferdinand III. Thus Maria Anna was simultaneously his aunt and grandmother while Margaret of Austria, Maria Anna's mother, was both his grandmother and great-grandmother. The inbreeding was so widespread in his case that all of his eight great-grandparents were descendants of Joanna and Philip I of Castile. This inbreeding had given many in the family hereditary weaknesses. That Habsburg generation was more prone to still-births than were peasants in Spanish villages.
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A smell of petroleum prevails throughout.
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