Ptolemy XIII Theos Philopator

Ptolemy XIII became co-ruler of Ptolemaic Egypt alongside his older sister Cleopatra VII after the death of their father Ptolemy XII Auletes. He was about 11 years old, with power exercised by regents Pothinus and Achillas.

Ptolemy XIII's forces besieged Julius Caesar and Cleopatra VII in the royal palace of Alexandria. The siege lasted several months and included the burning of the Great Library of Alexandria, though the extent of the damage is debated.

Ptolemy XIII's advisors, led by Pothinus, expelled Cleopatra VII from Alexandria, forcing her to flee to Syria. This act triggered the Alexandrian War and set the stage for Roman intervention in Egyptian affairs.

Ptolemy XIII's army was defeated by Caesar's forces at the Battle of the Nile. Ptolemy XIII drowned in the Nile while attempting to flee, ending his reign and leaving Cleopatra VII as the sole ruler of Egypt.