So, they did what royal siblings did in Alexandria. They got married. For a brief moment, the partnership worked. Cleopatra was the brilliant, ambitious adult; Ptolemy XIII was a boy surrounded by scheming eunuchs and generals. But three years in, the regents for Ptolemy XIII decided they didn’t want to share power with a strong-willed queen.

She married her other younger brother.

Cleopatra VII (the one we know) was no exception. When her father, Ptolemy XII, died in 51 BCE, he left a shocking legal bomb in his will: Cleopatra, age 18, would rule jointly with her younger brother, . cleopatra and brother

They kicked Cleopatra out of the palace. Exiled. Demoted.

That hammer was Julius Caesar.

And he was only ten years old. Let’s rewind. The Ptolemy dynasty—Cleopatra’s family—was Greek, not Egyptian. For nearly 300 years, they ruled Egypt with a single, horrifying tradition: keep the bloodline pure by marrying siblings, and keep the power by killing anyone who gets in your way.

Cleopatra, ever the strategist, saw her opening. The famous “carpet scene” (she had herself rolled in a rug and delivered to Caesar’s chambers) worked. She charmed Rome’s most powerful general, and Caesar agreed to enforce their father’s original will: Cleopatra and Ptolemy XIII must rule . So, they did what royal siblings did in Alexandria