Aspects of this topic are discussed in the following places at Britannica.
Upon landing in Alexandria in 48, Caesar captured the members of the Ptolemaic royal family, but Arsinoe managed to escape with the aid of Ganymedes, her mentor, and joined the Egyptian army headed by Achillas. Following a feud between Ganymedes and the Egyptian commander, Arsinoe ordered Achillas executed. Ganymedes pressed Caesar’s forces hard and negotiated an exchange of Arsinoe for Ptolemy...
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