The Islamic legal system of Sharia (Islamic law) and Fiqh (Islamic jurisprudence) is the most widely used religious law, and one of the three most common legal systems in the world alongside common law and civil law. It is based on both divine law, derived from the Qur'an and Sunnah, and the rulings of Ulema (jurists), who used the methods of "Ijma" (consensus), "Qiyas" (analogical deduction), "Ijtihad" (research) and "Urf" (common practice) to derive "Fatwā" (legal opinions). An Ulema was required to qualify for an "Ijazah" (legal doctorate) at a "Madrasa" (law school/college) before they could issue "Fatwā". During the Islamic Golden Age, classical Islamic law may have had an influence on the development of common law and several civil law institutions. Sharia law governs a number of Islamic countries, including Saudi Arabia and Iran, though most countries use Sharia law only as a supplement to national law. It can relate to all aspects of civil law, including property rights, contracts or public law.