The co-rule was uneasy from the start. Because Ptolemy XIII was a minor, Egypt was effectively run by a cabal of three powerful advisors:
Cleopatra famously had herself rolled in a carpet (or a linen sack) and delivered to Caesar’s quarters. Impressed by her ambition and charm, Caesar decided to support her claim to the throne. Ptolemy XIII was furious. cleopatra brother
The conflict between Ptolemy XIII and Cleopatra VII ultimately led to Ptolemy's death in 47 BC, during a battle with Caesar's forces. According to historical accounts, Ptolemy XIII drowned in the Nile River while trying to flee. The co-rule was uneasy from the start