Question: What Portugese poet popularized the concept of the Fifth Empire?
Sentence (from "Fernando Pessoa"): Fernando António Nogueira Pessoa (] ; June 13, 1888 – November 30, 1935), commonly known as Fernando Pessoa, was a Portuguese poet, writer, literary critic, translator, publisher and philosopher, described as one of the most significant literary figures of the 20th century and one of the greatest poets in the Portuguese language.
Relevant evidence: Yes