The Islamic Agricultural Revolution or Arab Agricultural Revolution (later known as the Medieval Green Revolution, Muslim Agricultural Revolution, Islamic Agricultural Revolution and Islamic Green Revolution) was a fundamental transformation in agriculture from the 8th century to the 13th century in the Muslim lands, a period known as the Islamic Golden Age. The term "Arab Agricultural Revolution" was coined by the historian Andrew Watson in 1974. This was an extension of an earlier hypothesis of an agricultural revolution in Islamic Spain, proposed much earlier in 1876 by the Spanish historian Antonia Garcia Maceira.