Helen Castor is a historian, writer and broadcaster.
Her last book, She-Wolves: The Women Who Ruled England Before Elizabeth, is published in the UK by Faber & Faber,
and in the US by HarperCollins.
In 2012, BBC Four and BBC Two broadcast three documentaries based on She-Wolves and presented by Helen - now available on DVD and iTunes.
Helen's new book, Joan of Arc: A History, is published by Faber & Faber in October 2014.