Mamillius is Leontes’s and Hermione’s son. He is a prince, beloved by all Sicilians, all of whom are waiting to see him grown.
He has something of a combative nature, being willing to fight (something to be hoped for in princes). Physically he resembles Leontes to a great degree. He has grown to the age where he does not wish to be treated as a baby, though as he is apparently still unbreeched and under the care of the women of the household, he is likely under seven years old. He is a tale-teller with a particularly talent for horror stories. Torn from his mother’s arms just as he is beginning one of these tales at her request, he falls ill, and after some weeks dies, just as his father blasphemes Apollo’s oracle.