•Why it earns a slot
Why it earns a slot: Yeats writes every love poem through an invented mask, Aedh, Michael Robartes, Hanrahan, so the ache stays mythic instead of confessional, and he appends his own notes at the back explaining the Sidhe, Niamh, and Knocknarea by name.
Yeats hides his 1899 love poems behind masks named Aedh and Michael Robartes, wooing women who dissolve into wind, tide, and dream.
This distillation is written from the freely available original, which is always the better read when you have the time: Project Gutenberg.