Algeria–Holy See relations
Although Islam is the state religion of Algeria, the Holy See has maintained a comparatively good relationship with the Algerian authorities, with Léon-Étienne Duval being famously recognized as the "bishop of Muslims" after the departure of French colonists.
Awlad Sidi Shaykh
The Awlad Sidi Shaykh (or Ouled Sidi Cheikh) was a confederation of Arab tribes in the west and south of Algeria led by the descendants of the Sufi saint Sidi Shaykh. The Awlad had religious authority, and also owned agricultural settlements and engaged in trade. During the French occupation of Algeria they alternately cooperated with and opposed the colonialists.