Why did The Book of Disquiet bring Fernando Pessoa worldwide attention after his death?

The Book of Disquiet (Livro do desassossego) brought Fernando Pessoa worldwide attention primarily because it represents a profound, diary-like collection of poetic fragments that showcases his unique literary genius. Although Pessoa died in 1935 as a virtual unknown, this work—which he labored over for the final two decades of his life—was published together for the first time in 1982, revealing the depth of his creative vision to a global audience.12

The work is attributed to his heteronym Bernardo Soares, one of the more than 70 alternative personae Pessoa created to express distinct philosophies, styles, and personalities. By presenting these fragments as the work of a separate author, the book exemplifies the "plural" nature of Pessoa’s identity, a hallmark of his contribution to Modernist literature. The subsequent publication of a full English translation in 2001 further cemented its status and expanded his international recognition.12