The reign of Alexander was not a long one. The son of Demetrius, who was called Demetrius also, claimed his father's throne, and made war against Alexander. Ptolemy led an army into Syria to assist his son-in-law. But that ungrateful and foolish prince treacherously conspired against the life of Ptolemy. The latter discovered the plot, and was so angry that he at once took his army over to the young Demetrius. Alexander was defeated and dethroned, and fled into Arabia. But it happened that in the battle Ptolemy's horse took fright at the bellowing of an elephant and threw his rider. Some of the soldiers of the enemy saw the accident, and rushing to where Ptolemy lay, they inflicted many dangerous wounds before they could be driven off by the Egyptians. Ptolemy was taken up mortally wounded, and died on the fifth day afterwards. Just before his death he received a present of the head of his enemy Alexander, sent him by an Arab chief to whom the defeated monarch had fled.