In late c. 210 BC , Agathoclea may have given birth to a son from her affair with Ptolemy IV , who may have died shortly after his birth .
Despite Ptolemy IV marrying his sister Arsinoe III in 220 BC , Agathoclea continued to be his favourite .
In late c. 210 BC , Agathoclea may have given birth to a son from Agathoclea 's affair Ptolemy IV   IV , who may have died shortly after his birth .
Despite Ptolemy IV marrying his sister Arsinoe III in 220 BC , Agathoclea continued to be his favourite .