This is one of my favorite books. Prince Myshkin, also referred to as the gullible idiot, is the main character. He is involved in a love triangle that does not end well. I might have said too much already.
The Idiot, by Fyodor Dostoyevsky. In The Idiot Dostoevsky attempts to portray the ideal man—a "positively beautiful individual." Prince Myshkin represents all the qualities Dostoevsky deems the best aspects of a human being.