Which younger brother co-ruled with Cleopatra after Ptolemy XIII died?

Which younger brother co-ruled with Cleopatra after Ptolemy XIII died? The answer is Ptolemy XIV.

Ptolemy XIV Philopator became nominal pharaoh after his older brother, Ptolemy XIII, died in January 47 BC. Cleopatra, who was his older sister, was restored to power after the Alexandrian War and ruled alongside him according to Ptolemaic dynastic custom.

The siblings were formally married, as was common among the Ptolemies, whose rulers used close-kin marriages to preserve the royal succession. In practice, however, Ptolemy XIV was a child and appears to have exercised little real authority. Cleopatra remained the dominant political figure and continued her relationship with Julius Caesar.

Ptolemy XIV died in 44 BC, shortly after Caesar’s assassination. Ancient and later writers sometimes suggested that Cleopatra arranged his death, but the precise cause remains uncertain. She then made her son Caesarion her co-ruler as Ptolemy XV.