Sources

http://www.mce.k12tn.net/middleages/feudalsystem.htm


http://www.learner.org/interactives/middleages/feudal.html


http://www.middle-ages.org.uk/feudal-system.htm


http://library.thinkquest.org/10949/fief/hifeudal.html


http://www.medievalresources.com/images/feudal_wupv.gif