English poet (1812-1889) who perfected the dramatic monologue in such works as My Last Duchess and Soliloquy of the Spanish Cloister. ALS, one page, 4.5 x 7, February 16, 1874. Handwritten letter to Mrs. O'Shaughnessy, in full: "Thank you very much for your kind invitation. I have unluckily a standing engagement for all Sunday evenings. Will you give my kindest remembrances to your father & husband." In fine condition, with toning from prior display. Accompanied by a full letter of authenticity from Beckett Authentication Services.