Twain and Wilde met in Berlin in the early 1890s, 1892 I believe, though I'd have to check my files to be sure. They might have met one another some time earlier, but I can't recall it at the moment. I know about the Berlin meeting because Susy refers to it in her letters to Louise Brownell. I hesitate to say more about the correspondence for fear people will think I am fixated on 19th century homosexuality. Andy Hoffman