Ayyār (Arabic: عيار, romanized: ʿayyār, pl. ʿayyārūn; Persian: عیار, romanized: Ayyâr, pl. Ayyârân) refers to a person associated with a class of warriors in Iraq and Persia from the 9th to the 12th centuries. The word literally means vagabond. The 'Ayyarun were associated with futuwwa, or medieval Islamic organizations located in cities. They were notable for being youth groups, typically from lower classes, that engaged in violent acts, thievery, assassinations, and violent rebellions against established systems in many Islamic cities. Often clashing with the ruling dynasties. They typically gain power within a city once a centralized body is weakened.
