Sebastianists are followers of a historical and religious movement that emerged in Portugal during the late 16th century. They believe in the return of King Sebastian, who mysteriously disappeared during the Battle of Alcácer Quibir in 1578. This belief is rooted in the idea that he will return to restore the Portuguese monarchy and bring about a new era of prosperity. The movement is often associated with themes of messianism and hope for national revival. Over the years, Sebastianists have influenced various cultural and political aspects in Portugal, reflecting a longing for a lost golden age and a desire for divine intervention in the nation's fate.