It is also called millennial. He is a person who follows the doctrines of millennialism or chyliasm. It is a doctrine that says that before the final judgment, Jesus Christ will come to earth and rule for a millennium, until evil is completely eliminated. He had his followers in the 2nd century, in the Middle Ages and in South America in the twentieth century especially in Chile.
From Greek chilia, a thousand. Defender of millennialism or chyliasm, a belief originated in the book of Revelation, that Christ will reign in the world for a thousand years before the end. From the beginning of Christianity it was thought that this parusia would be imminent. Many sects especially within the reformist orientation continue to announce it and some walking preachers now too. Even Kant himself, educated in Pietism, admitted this 18th-century belief in "Ideas for a Universal History in Cosmopolitan Key".