Helen Castor is a historian, writer and broadcaster.

Her latest book, She-Wolves: The Women Who Ruled England Before Elizabeth, is published in the UK by Faber & Faber, and in the US by HarperCollins.

BBC4 will broadcast three documentaries based on She-Wolves and presented by Helen, starting on Wednesday 7 March 2012 at 9pm.

'Helen Castor has an exhilarating narrative gift ... I think readers will love this book.' Hilary Mantel