Christian denominations established in the 12th century

The Waldensians, also known as Waldenses (), Vallenses, Valdesi, or Vaudois, are adherents of a church tradition that began as an ascetic movement within Western Christianity before the Reformation. Originally known as the Poor of Lyon in the late 12th century, the movement spread to the Cottian Alps in what is today France and Italy. The founding of the Waldensians is attributed to Peter Waldo, a wealthy merchant who gave away his property around 1173, preaching apostolic poverty as the way to perfection.

275px|thumbnail|right|The burning of the Amalricians in 1210, in the presence of King Philip II of France. In the background is the [[Gibbet of Montfaucon and, anachronistically, the Grosse Tour of the Temple. Illumination from the Grandes Chroniques de France, c. 1255–1260.]]