Arsinoe III Philopator (Ancient Greek: Ἀρσινόη ἡ Φιλοπάτωρ, which means "Arsinoe the father-loving", 246 or 245 BC – 204 BC) was Queen of Egypt in 220 – 204 BC. She was a daughter of Ptolemy III and Berenice II. She was the first Ptolemaic queen to bear a child by her brother. Arsinoe and her spouse were loved and well respected by the Egyptian public.
Between late October and early November 220 BC she was married to her brother, Ptolemy IV. She took active part in the government of the country, at least in the measure that it was tolerated by the all-powerful minister Sosibius.
In 217 BC, she accompanied Ptolemy IV along with 55,000 troops at the Battle of Raphia in Palestine against Antiochus the Great with 68,000 troops. Arsinoe may have commanded a section of the infantry phalanx. Both sides employed cavalry, elephants, and specialized troops such as archers, as well as traditional Macedonian phalanx. When the battle went poorly, she appeared before the troops and exhorted them to fight to defend their families. She also promised two minas of gold to each of them if they won the battle, which they did. No army again threatened Ptolemaic Egypt until Augustus fought Antony and Cleopatra at Actium almost two centuries later.
In summer, 204 BC, Ptolemy IV died. His two leading favorites, Agathocles and Sosibius, fearing that Arsinoe would secure the regency, had her murdered in a palace coup before she heard of her husband's death, thereby securing the regency for themselves.
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^Tyldesley, Joyce (2006). Chronicle of the Queens of Egypt: From Early Dynastic Times to the Death of Cleopatra. London, UK: Thames & Huson Ltd. p. 194. ISBN0500051453.
^ abcdPennington, Reina (2003). Amazons to Fighter Pilots: A Biographical Dictionary of Military Women. Westport, CT: Greenwood Press. p. 25. ISBN0313327076.
^Meyers, Carol; Craven, Tony; Kraemer, Ross S., eds. (2000). Women in Scripture: A Dictionary of Named and Unnamed Women in the Hebrew Bible, the Apocryphal/Deuterocanonical Books, and the New Testament. New York: Houghton Mifflin. p. 397. ISBN0-395-70936-9.