Picked up a few short books on King Arthur whilst in Tintagel recently. This one covers the search for the historical King Arthur - if such a person existed. A comprehensive review of writings and history of the time. Interesting how little is known of the 400-600AD period after the Romans left Britain and how poor documentation is.
Picked this up in Glastonbury last year, very much full of facts and doesn't expand too much in Arthur's legend like I though it would. Its worth a read if you are wanting to learn more about Arthur