In 1131 Philippe of France eldest son and co-King of Louis VI of France was riding with a group of companions along the Seine, in the Parisian market section named the Greve, his running horse was tripped by a black pig which darted out of a dung heap on the quay. The horse fell forwards, and the young king was catapulted over its head. The fall "so dreadfully fractured his limbs that he died on the day following" without regaining consciousness. He was succeeded as heir, and co-King, by his meek-mannered brother, Louis the Younger (now known as Louis VII).
If Philip had been little other than trouble and a problem to his family and kingdom whilst he had lived, his legacy would prove greater trouble still. Whilst he had lived, he had nurtured a dream of visiting Jerusalem and the tomb of Christ; when he died, his brother, Louis VII, vowed to go in Philip's place. This vow would provide a reason for Louis joining the disastrous Second Crusade, and an excuse to abandon Antioch in favour of Jerusalem – the Crusade bringing many deaths on both sides, the abandonment of Antioch proving a strategic failure and a cause for the collapse of the marriage between Louis and his wife, Eleanor of Aquitaine.
WI Philippe never has this accident or survives with minor injuries? How is that altering History? Any thoughts? Would he married Eleanor instead of his younger brother??