  arsinoÃ« iv (greek: , betw. 65 and 58&nbsp;bc â 41&nbsp;bc) was the youngest daughter of ptolemy xii auletes and queen and co-ruler of egypt from 48 bc-47 bc, making her one of the last members of the ptolemaic dynasty of ancient egypt. arsinoe iv was the half-sister of cleopatra vii and ptolemy xiii, sharing a father, but having a different mother.http://www.kingtutone.com/queens/cleopatra/idea/the lives of cleopatra and octavia, by sarah fielding, christopher d. johnsonhttp://books.google.com/books?id=cpgr2mw2ouec&pg=pa154&lpg=pa154&dq=%2bcleopatra,+%2b%22half+sister%22,+%2b%22dio+cassius%22,+%2barsinoe&source=bl&ots=3y-cklns88&sig=ob2xbb9viaupbzjnnkw6ivsqa5i&hl=en&ei=tbtfsylciipu7aoi_owqda&sa=x&oi=book_result&ct=result&resnum=10http://www.egyptvoyager.com/features_womeninancientegypt_cleopatra.htm ==history== when ptolemy xii died in 51 bc, he left his children, ptolemy and cleopatra, as joint rulers of egypt, but her brother soon dethroned cleopatra and forced her to flee from alexandria. when julius caesar arrived in alexandria in 48&nbsp;bc and sided with cleopatra's faction, arsinoÃ« escaped from the capital with her mentor, the eunuch ganymedes, and joined the egyptian army which, under achillas, was besieging alexandria. achillas then assumed the title of pharaoh. when achillas and ganymedes clashed, arsinoÃ« had achillas executed and ganymedes placed in command of the army.julius caesar, commentarii de bello civili 3.112.10-12; de bello alexandrino 4; cassius dio, roman history 42.39.1-2; 42.40.1; lucan, pharsalia 10.519-523 ganymedes initially enjoyed some success against the romans, but the leading egyptian officers were soon dissatisfied with him. under a pretext of wanting peace, they negotiated with caesar to exchange arsinoÃ« for ptolemy xiii, who was subsequently released.de bello alexandrino 23-24 and, with some deviations, cassius dio, roman hist
1st-century_BC_births 1st-century_BC_female_rulers 41_BC_deaths Cleopatra Egyptian_queens_regnant Hellenistic_Egyptians Pharaohs_of_the_Ptolemaic_dynasty Ptolemaic_dynasty