Jihadism is a neologism for militant Islamic movements that seek to base the state on Islamic principles. In a narrower sense, it refers to the belief held by some Muslims that armed confrontation with political rivals is an efficient and theologically legitimate method of socio-political change. It is a form of religious violence and has been applied to various insurgent Islamic extremist, militant Islamist, and terrorist individuals and organizations whose ideologies are based on the Islamic notion of lesser jihad from the classical interpretation of Islam. It has also been applied to various Islamic empires in history, such as the Rashidun and Umayyad caliphates of the early Muslim conquests, and the Ottoman Empire. There were also the Fula jihads in West Africa in the 18th and 19th centuries.