Her sister Arsinoe was younger by one or more years and the older of their two brothers was just ten. Their father had intended Ptolemy XIII and Cleopatra to rule jointly. It is normally assumed that they were quickly married in accordance with the family tradition, but no source explicitly tells us this, and it was unusual for a Ptolemaic king to take a wife who was so much older. On the other hand, if Ptolemy XIII had subsequently married then friction would always have been likely between his wife and his sister and co-ruler, so in many respects marriage between the royal siblings encouraged stability. It is also possible that a marriage was planned, but did not actually take place. We do not know how Auletes died and whether his death was sudden or long anticipated. This means that it is uncertain how far he prepared the way for the succession. There were problems from the beginning. Ptolemy XIII was a minor who could not rule himself and so required some form of regency.
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