http://www.timeref.com/castindx.htm - Medieval Castle Timeline
http://www.timeref.com/why_castles_were_built.htm - Why were castles built
http://www.gridclub.com/subscribers/info/fact_gadget_2009/1001/history/the_middle_ages/556.html - Why were castles built
http://www.castlewales.com/life.html/ Basic knowledge - Intro
http://www.timeref.com/why_castles_were_built.htm - Why were castles built
http://www.gridclub.com/subscribers/info/fact_gadget_2009/1001/history/the_middle_ages/556.html - Why were castles built
http://www.castlewales.com/life.html/ Basic knowledge - Intro