[5] Between late October and early November 220 BC, she was married to her younger brother, Ptolemy IV.

She took an active part in the government of the country, at least in the measure that it was tolerated by the all-powerful minister Sosibius.

[6] Both sides employed cavalry, elephants, and specialized troops such as archers, as well as traditional Macedonian phalanx.

Eratosthenes wrote a manuscript called the Arsinoe, which is lost, the subject being a memoir of the queen.

[9] Portraits of her likeness are also rare, but do exist in the forms of a bust of marble,[10] and another of bronze.