Sebastianist Literature refers to a genre of writing that emerged in Portugal during the late 16th and early 17th centuries. It is centered around the figure of King Sebastian, who mysteriously disappeared in the Battle of Alcácer Quibir in 1578. This literature often expresses themes of longing, hope, and the idea of a lost king who would return to restore the nation. The works in this genre typically blend elements of history, myth, and prophecy, reflecting the cultural and political anxieties of the time. Authors like António Vieira and Camões contributed to this literary movement, using their writings to explore the implications of Sebastian's disappearance and the desire for national renewal.