The Salafi movement or Salafism is a fundamentalist revival movement within Sunni Islam, originating in the late 19th century and influential in the Islamic world to this day. The name "Salafiyyah" is a self-designation, claiming a return to the traditions of the predecessors, the first three generations of Muslims, who are believed to exemplify the pure form of Islam. In practice, Salafis claim that they rely on the Qur'an, the Sunnah and the Ijma (consensus) of the salaf, giving these writings precedence over what they claim as "later religious interpretations". The Salafi movement aimed to achieve a renewal of Muslim life, and had a major influence on many Muslim thinkers and movements across the Islamic world. Political scientist Gilles Kepel defines Salafism as:A school of thought which surfaced in the second half of the nineteenth century as a reaction to the spread of European ideas. It advocated a return to the traditions of the devout ancestors.