Songwriter, poet, and author; daughter of Thomas Sheridan and sister of Caroline Sheridan Norton; married Price Blackwood who later became Lord Dufferin; her son published Songs, Poems, & Verses by Helen, Lady Dufferin with a memoir in 1894; many years after Lord Dufferin's death she married George Hay, Earl of Gifford. See Boase III: 548, ODNB.