Megapenthes is a name that means 'great sorrow', from megas, 'great' and penthos, 'grief. It was the name of, among others, the son of Proëtus and Stheneboea, and the bastard son of Menelaüs and his slavegirl Pieris (or Tere'is). For Proëtus' son the name could be taken as referring to the sorrow occasioned to their father by the madness of Megapenthes' sisters.