Hello Bernard,
it’s the first time that I contact you. My name is Nicolas and for long time I was involved to investigate the Great Britain history, myths and legends, one of them is the legend of King Arthur and Merlin. During my investigation I read Sir Thomas Mallory version, and then I found that he based your book in the Geoffrey of Montmouth books. So I read History of the Britain’s Kings ant then I found your books… And I have finished to read the warlords chronicles, and I found that Lord Derfel probably was inspired in Geoffrey of Montmouth, it is correct? I found that monastery of Dinnewrac in Powys was near to Gwent and Gwent was named Monmouthshire, for these reason I conclude that maybe Lord Derfel was inspired in Geoffrey of Montmouth. I read your trilogy of Arthur and I conclude that is the best and real history, and read the Geoffrey of Montmouth book I found similar things. Well I hope that you are well. I enjoy a lot The last Kingdom too, books and Netflix series.
I send a big hug from Uruguay, South America.
Nicolas Daoudian