Proper noun

So in regard to the legends of Greece,?—?Troy, Thêbes, the Argonauts, the Boar of Kalydôn , Hêraklês, Thêseus, Œdipus,?—?the conviction still holds in men’s minds, that there must be something true at the bottom?;?and many readers of this work may be displeased, I fear, not to see conjured up before them the Eidôlon of an authentic history, even though the vital spark of evidence be altogether wanting.¹