Darius therefore began raising a huge new army with which he meant to completely subjugate Greece; however, in 486 BC, his Egyptian subjects revolted, indefinitely postponing any Greek expedition.[12] Darius then died while preparing to march on Egypt, and the throne of Persia passed to his son Xerxes I.[20] Xerxes crushed the Egyptian revolt, and very quickly restarted the preparations for the invasion of Greece.[21]