Despite Ptolemy IV marrying his sister Arsinoe III in 220 BC , Agathoclea continued to be his favourite .
Polybius ( 15.31. 13 ) , states that Agathoclea claimed to have a wet - nurse to the son of Ptolemy IV .
Despite Ptolemy IV marrying Ptolemy IV 's sister Arsinoe III in 220 BC , Agathoclea continued to be his favourite .
Polybius ( 15.31. 13 ) , states that Agathoclea claimed to have a wet - nurse to the son of Ptolemy IV .