According to the Dangerous Women Project, Arsinoe IV was one of five children of Ptolemy XII, a rather unpopular pharaoh of the Ptolemaic dynasty. He was so unpopular that one of his children, Berenice, attempted to oust him and even ruled on her own for a short time. According to Doomed Queens, Berenice met her untimely end via execution in 55 B.C.E., after her father's three-year absence.
The Ptolemys were, clearly, a pretty ruthless family. In 48 B.C.E., as per the Dangerous Women Project, Ptolemy XIII was co-ruler of Egypt with his sister, Cleopatra VII. Young Ptolemy didn't want the competition, however, and kicked Cleopatra out. The two siblings began to war against one another, leaving an opportunity open for Arsinoe to set herself up as a pharaoh. She eventually teamed up with Ptolemy XIII against Cleopatra, but their elder sister had an even bigger ally — Julius Caesar. Eventually, Ptolemy XIII was killed, while Arsinoe made it through Roman captivity to see her own sister take up with Mark Antony. Yet, Cleopatra still saw Arsinoe, who was being addressed as "queen" again by some Egyptians, as a threat. She had Arsinoe assassinated, as the younger ruler and her supporters still posed a serious threat to Cleopatra.
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