Ranked, counted, annotated. The archive's weakness for enumeration. New entries added as the catalog grows.
Not tragedies, not accidents, the large, deliberate, well-funded failures that somebody genuinely believed would work. More to learn here, I'd argue, than from the successes.
Louis XIX of France held France for twenty minutes. Lady Jane Grey held England for nine days. Six exceptionally short reigns from succession records and contemporary chronicles.
Bloodletting, mercury for syphilis, trepanation, mummy powder, tobacco-smoke enemas. A catalog of confident, well-intentioned harm from the medieval and early modern record.