No statutes marked the introduction or early development of the feudal system of land tenure in England. The English law of real property during this period was strictly an unwritten and customary one. The statutes of the twelfth century which created the various forms of all real actions had considerable indirect influence upon the law of real property, but it was not until near the close of the thirteenth century that we have any important statutes on the substantive law of real property. The statute of 13 Edward I, known as the Statute of De Donis, abolished the estate known as the fee conditional, which often failed to accomplish the purpose of the grantor, and substituted the new form of estate known as the fee tail. A full account of both of these estates will be found under the subject of Real Property.

Five years after the Statute of De Donis came the Statute of Quia Emptores (18 Edward I. - A. D. 1290). Up to this time, the alienation of land had been prohibited, but every owner had been allowed to subin-feudate his land indefinitely, this statute prohibited subinfeudation and legalized the alienation of land.