Brain Snacks: Tasty Tidbits of Knowledge
Not only did Yeats long desire Maud Gonne, who married someone else in 1903, he even proposed to her daughter. (Yeah—she said no, too.) (Source)
Though he was a writer most of his life, Yeats' greatest works are considered to be the ones he wrote between 50-75. (Source)
Yeats planned to be a painter before settling on poetry. It looks like that decision paid off. (Source)