the simplest explanation is that the story adumbrated in the little notebook is actually earlier than that in the fall of condolin ; that meglin did not yet exist ; and that subsequently the image of the 'ugly miner -- unsuccessful suitor ' became that of the son , the object of desire becoming idril ( niece of isfin ) , while a new story was developed for the father , eol the dark elf of the forest who ensnared isfin .