Shōen, from about the 8th to the late 15th century, describes any of the private, tax-free, often autonomous estates or manors whose rise undermined the political and economic power of the emperor and contributed to the growth of powerful local clans. The estates developed from land tracts assigned to officially sanctioned Shintō shrines or Buddhist temples or granted by the emperor as gifts to the Imperial family, friends, or officials. As these estates grew, they became independent of the civil administrative system and contributed to the rise of a local military class. With the establishment of the Kamakura shogunate, or military dictatorship, in 1192, centrally appointed stewards weakened the power of these local landlords. The shōen system passed out of existence around the middle of the 15th century, when villages became self-governing units, owing loyalty to a feudal lord ("daimyō") who subdivided the area into fiefs and collected a fixed tax.