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How did Julius Caesar help Cleopatra VII return to power in Egypt?

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Ptolemaic sculpture — Ptolemaic dynasty Head of a queen, marble sculpture possibly made in Egypt, Ptolemaic period (305–30 bce); in the Brooklyn Museum, New York. 14 × 12 × 11.5 cm.

Julius Caesar played a decisive role in restoring Cleopatra VII to the Egyptian throne by intervening in the power struggle between her and her brother, Ptolemy XIII. After arriving in Alexandria, Caesar seized the palace quarter and ordered the warring siblings to submit to his arbitration, citing the will of their father, Ptolemy XII Auletes.12

Caesar’s support was motivated by a desire to secure repayment for debts incurred by the late king and to stabilize Egypt as a Roman ally. When Ptolemy XIII’s advisors continued to foment opposition, Caesar effectively dismantled their influence by facilitating the execution of the court official Pothinus and engaging in the Alexandrian War against the forces of Ptolemy XIII and his sister Arsinoe.12

Following the arrival of Roman reinforcements, Ptolemy XIII fled and drowned in the Nile while attempting to escape. With her brother-husband dead, Cleopatra was restored to the throne, eventually marrying her younger brother, Ptolemy XIV, to maintain her rule.12