In August 1270, when Philip was two years old, his grandfather died while on Crusade, his father became king, and his elder brother Louis became heir apparent. Only five months later, in January 1271, Philip's mother died after falling from a horse; she was pregnant with her fifth child at the time and had not yet been crowned queen beside her husband. A few months later, one of Philip's younger brothers, Robert, also died. Philip's father was finally crowned king at Rheims on 15 August 1271. Six days later, he married again; Philip's step-mother was Marie, daughter of the duke of Brabant.