The Book of Disquiet (Livro do Desassossego: Composto por Bernardo Soares, ajudante de guarda-livros na cidade de Lisboa) is a work by the Portuguese author Fernando Pessoa (1888–1935). Published posthumously, The Book of Disquiet is a fragmentary lifetime project, left unedited by the author, who introduced it as a "factless autobiography." The publication was credited to Bernardo Soares, one of the author's alternate writing names, which he called semi-heteronyms, and had a preface attributed to Fernando Pessoa, another alternate writing name or orthonym. Source: Wikipedia (en)