The United Society of Believers in Christ's Second Appearing, more commonly known as the Shakers, are a millenarian restorationist Christian sect founded c. 1747 in England and then organized in the United States in the 1780s. They were initially known as "Shaking Quakers" because of their ecstatic behavior during worship services.

Restorationism, also known as Restitutionism or Christian primitivism, is a religious perspective according to which the early beliefs and practices of the followers of Jesus were either lost or adulterated after his death and required a "restoration". It is a view that often "seeks to correct faults or deficiencies by appealing to the primitive church as normative model".