Topic summaryPenthilus Expand Summary Extracted from the Wikipedia article Penthilus (son of Orestes). FamilyPenthilus' grandmother was Clytemnestra. His maternal and paternal grandfathers were Aigisthos and Agamemnon respectively. Penthilus fathered two sons, Echelatus (Echelas or Archelaüs), and Damasias (Damasius), father of Agorius. Wikipedia source