Louis X

Known as Louis the Quarrelsome, he reigned barely twenty months before dying suddenly after an over-vigorous game of jeu de paume. His one act of historical note was an edict declaring that any slave setting foot on French soil was thereby freed — a principle that endured into the modern era. He left a posthumous son, the doomed John I, and a reigning sister whose disqualification on grounds of sex would set the precedent of Salic succession.