Cleopatra
Accession to the throne

Ptolemy XII died sometime before 22 March 51 BC, when Cleopatra, in her first act as queen, began her voyage to Hermonthis, near Thebes, to install a new sacred Buchis bull, worshiped as an intermediary for the god Montu in the Ancient Egyptian religion. Cleopatra faced several pressing issues and emergencies shortly after taking the throne. These included famine caused by drought and a low level of the annual flooding of the Nile, and lawless behavior instigated by the Gabiniani, the now unemployed and assimilated Roman soldiers left by Gabinius to garrison Egypt. Inheriting her father's debts, Cleopatra also owed the Roman Republic 17.5 million drachmas.

In 50 BC Marcus Calpurnius Bibulus, proconsul of Syria, sent his two eldest sons to Egypt, most likely to negotiate with the Gabiniani and recruit them as soldiers in the desperate defense of Syria against the Parthians. The Gabiniani tortured and murdered these two, perhaps with secret encouragement by rogue senior administrators in Cleopatra's court. Cleopatra sent the Gabiniani culprits to Bibulus as prisoners awaiting his judgment, but he sent them back to Cleopatra and chastised her for interfering in their adjudication, which was the prerogative of the Roman Senate. Bibulus, siding with Pompey in Caesar's Civil War, failed to prevent Caesar from landing a naval fleet in Greece, which ultimately allowed Caesar to reach Egypt in pursuit of Pompey.

By 29 August 51 BC, official documents started listing Cleopatra as the sole ruler, evidence that she had rejected her brother Ptolemy XIII as a co-ruler. She had probably married him, but there is no record of this. The Ptolemaic practice of sibling marriage was introduced by Ptolemy II and his sister Arsinoe II. A long-held royal Egyptian practice, it was loathed by contemporary Greeks. By the reign of Cleopatra, however, it was considered a normal arrangement for Ptolemaic rulers.

Despite Cleopatra's rejection of him, Ptolemy XIII still retained powerful allies, notably the eunuch Potheinos, his childhood tutor, regent, and administrator of his properties. Others involved in the cabal against Cleopatra included Achillas, a prominent military commander, and Theodotus of Chios, another tutor of Ptolemy XIII. Cleopatra seems to have attempted a short-lived alliance with her brother Ptolemy XIV, but by the autumn of 50 BC Ptolemy XIII had the upper hand in their conflict and began signing documents with his name before that of his sister, followed by the establishment of his first regnal date in 49 BC.
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