Quia Emptores
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Quia Emptores is a statute passed in the reign of Edward I of England in 1290 that prevented tenants from alienating their lands to others by subinfeudation, instead requiring all tenants who wished to alienate their land to do so by substitution. The statute, along with its companion statute of Quo Warranto, was intended to remedy land ownership disputes and consequent financial difficulties that had resulted from the decline of the traditional feudal system during the High Middle Ages.