From the mid-8th century on, particularly in the north, the relationship between peasants and the land became increasingly characterized by the extension of the new "bipartite estate" system (manorialism), in which peasants (who were bound to the land) held tenant holdings from a lord or monastery (for which they paid rent), but were also required to work the lord's own "demesne"; in the north, some of these estates could be quite substantial. This system remained a standard part of lord-tenant relations into the 12th century.