Kingdoms of the British Isles 1000-1600 - Interactive time chart of the Royal Houses of Britain the 11th thru 17th centuries. www.pauls-room.com/uk/monarchy.htm
The British Monarchy: History of the Monarchy - Detailed histories of the monarchies of England and Scotland from inception to 1603 and of the United Kingdom to the present day. Includes family trees of royal houses (in PDF format). www.royal.gov.uk/output/Page5.asp
