Philip II fell ill in September 1222 and had a will made, but carried on with his itinerary. Hot weather the next summer worsened his fever, but a brief remission prompted him to travel to Paris on 13 July 1223, against the advice of his physician. He died en route the next day, in Mantes-la-Jolie, at the age of 58. His body was carried to Paris on a bier. He was interred in the Basilica of St Denis in the presence of his son and successor by Isabella of Hainaut, Louis VIII, as well as his illegitimate son Philip I, Count of Boulogne and John of Brienne, the King of Jerusalem.