When Cyrus conquered Babylon in 539 BC he was employed in leading religious ceremonies, and in the cylinder which contains Cyrus' proclamation to the Babylonians his name is joined to that of his father in the prayers to Marduk. On a tablet dated from the first year of Cyrus, Cambyses is called king of Babylon, although his authority seems to have been quite ephemeral; it was only in 530 BC, when Cyrus set out on his last expedition into the East, that he associated Cambyses on the throne, and numerous Babylonian tablets of this time are dated from the accession and the first year of Cambyses, when Cyrus was "king of the countries" (i.e. of the world). After the death of his father in August 530, Cambyses became sole king. The tablets dated from his reign in Babylonia run to the end of his eighth year, i.e. March 522 BC. Herodotus (3.66), who dates his reign from the death of Cyrus, gives him seven years five months, i.e. from 530 BC to the summer of 523.
Cambyses wants to marry a daughter of Amasis, who sends him a daughter of Apries instead of his own daughter, and by her Cambyses is induced to begin the war. His great crime is the killing of the Apis bull, for which he is punished by madness, in which he commits many other crimes, kills his brother and his sister, and at last loses his empire and dies from a wound in the thigh, at the same place where he had wounded the sacred animal. Intermingled are some stories derived from the Greek mercenaries, especially about their leader Phanes of Halicarnassus, who betrayed Egypt to the Persians. In the Persian tradition the crime of Cambyses is the murder of his brother; he is further accused of drunkenness, in which he commits many crimes, and thus accelerates his ruin.
These traditions are found in different passages of Herodotus, and in a later form, but with some trustworthy detail about his household, in the fragments of Ctesias. With the exception of Babylonian dated tablets and some Egyptian inscriptions, we possess no contemporary evidence about the reign of Cambyses but the short account of Darius in the Behistun Inscription. It is impossible from these sources to form a correct picture of Cambyses' character; but it seems certain that he was a wild despot and that he was led by drunkenness to many atrocious deeds.
But this hope failed, as the Cypriot towns and the tyrant Polycrates of Samos, who possessed a large fleet, now preferred to join the Persians, and the commander of the Greek troops, Phanes of Halicarnassus, went over to them. In the decisive battle at Pelusium the Egyptian army was defeated, and shortly afterwards Memphis was taken. The captive king Psammetichus was executed, having attempted a rebellion. The Egyptian inscriptions show that Cambyses officially adopted the titles and the costume of the Pharaohs.
Cambyses attempted to march against him, but, seeing probably that success was impossible, died by his own hand (March 522). This is the account of Darius, Cambyses' lance-bearer at the time, which certainly must be preferred to the traditions of Herodotus and Ctesias, which ascribe his death to an accident, although it has also been speculated that Cambyses may in fact have been murdered by Darius as the first step to usurping the empire for himself
According to Herodotus (3.64) he died in Ecbatana, i.e. Hamath; Josephus (Antiquites xi. 2. 2) names Damascus; Ctesias, Babylon, which is absolutely impossible.
Cambyses was buried in Pasargadae. The remains of his tomb were identified in 2006.
A 2002 novel by Paul Sussman The Lost Army Of Cambyses (ISBN 0-593-04876-8) recounts the story of rival archaeological expeditions searching for the remains.
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