Brain Snacks: Tasty Tidbits of Knowledge
Gonne's nickname, at least in the American papers, was "The Irish Joan of Arc." Check out this article from 1897 describing her visit to America (source).
Gonne appears in a not-insignificant amount of Yeats's poetry. Here she is in "The Old Age of Queen Maeve": "Fashioned to be the mother of strong children;/ And she'd had lucky eyes and a high heart./ And wisdom that caught fire like the dried flax./ At need, and made her beautiful and fierce,/ Sudden and laughing."
Maud Gonne gave Yeats a notebook in 1908 that he kept for the rest of his life. The notebook records how both he and Gonne were interested in the supernatural and occult (source).