The Fifth Empire (Portuguese: Quinto Impรฉrio) is an esoteric concept of a global Portuguese empire with spiritual and temporal power, based on an interpretation ofย Daniel 2ย and theย Book of Revelation, whose origins lay withย Antรณnio Vieira. The concept was re-popularized in the twentieth century with the publication ofย Mensagemย byย Fernando Pessoaย in 1934.