http://www.britannia.com/history/
http://www.historyonthenet.com/Chronology/timelineroman.htm
http://www.worldbookonline.com/
http://en.wikipedia.org/wiki/Main_Page
www.britainexpress.com/History/Late_Roman_Britain.htm
The Roman World
The Sword in the Stone by TH White
King Arthur (2004)
Excalibur (1981)
First Knight (1995)
The Lost Years of Merlin by TA Barron