Piers Langham is poverty-stricken and without friends when he saves a young woman who is serving as lady-in-waiting to Anne Neville, daughter of Warwick the Kingmaker. This action leads him, in a roundabout way, into the service of Richard of Gloucester (later Richard II), and he becomes witness not just to the battles but to the romance between Anne and Richard.
Richard is here cast as heroic and worthy of admiration, and the connection between Anne and Richard one of voluntary love, so this would definitely be considered hagiographic
A rather dated romance but the dates of the battles, etc. appear to be mostly accurate and the setting is not too far off.

http://shelfandstuff.blogspot.com/2009/06/warwick-heiress-by-margaret-abbey.html ( )