In the 18th century, Muhammad ibn Abd al-Wahhab led a Salafi movement, referred by outsiders as Wahhabism, in modern-day Saudi Arabia. Originally shaped by Hanbalism, many modern followers departed from any of the established four schools of law Hanafi, Shafi, Maliki, and Hanbali. Similarly, Ahl al-Hadith is a movement that deemphasized sources of jurisprudence outside the Quran and Hadith, such as informed opinion (ra'y).