How did Julius Caesar help Cleopatra VII return to power?

Julius Caesar helped Cleopatra VII regain her throne by providing the military and political support necessary to overcome her brother and co-ruler, Ptolemy XIII.12

After Cleopatra was forced to flee Egypt, she recognized that she needed Roman intervention to reclaim power. Upon Julius Caesar’s arrival in Egypt—following the death of Pompey—he and Cleopatra formed a political and personal alliance, with each seeking to use the other to achieve their respective goals.12

Caesar and Cleopatra were besieged together in Alexandria during the winter. The conflict concluded the following spring when Roman reinforcements arrived. During the ensuing struggle, Ptolemy XIII fled and drowned in the Nile, which effectively removed Cleopatra's primary rival. Following this victory, Cleopatra was restored to the throne, eventually ruling alongside her other brother, Ptolemy XIV.12