Feudalism, where two people agreed that one would give something (land, a yearly salary) to another. In return, the recipient promised service (military, labor). The giver was the "lord" and the recipient the "vassal." "Vassals" could make agreements with more than one person and could in turn promise lands or income to someone else. Thus, feudalism did not create a clear social "pyramid" with one person on top except in one country, invaded in 1066 by Normans. What was the nation that had this clear "pyramid" of feudal obligations?