The Habsburgs’ astonishing longevity stemmed above all from the ability of the senior male to produce heirs and avoid going mad. A successor and a reasonable level of bureaucratic and kingly ability in a world based around heredity and hierarchy meant that, with a couple of spectacular wobbles, they were able to keep going without the British or Spanish habit of the principal stem simply running out. There were many reasons for hating the Habsburgs or being bored by them, but the family itself gave very few chances for its enemies to bring it down on dynastic or competence grounds – the
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