Uncommon Vows: A medieval prequel to the Bride Trilogy:

An uncommon love story... Wrenched from a monastery before taking final vows, Adrian de Lancey's fighting skill wins him an earldom. Fierce discipline masters his darker nature--until he finds a winsome slip of a girl lost in his forest, an illegal falcon on her wrist. Encountering the ice-blond warrior Earl of Shropshire, Meriel de Vere knows his dangerous reputation--and hides her identity to protect her brother's estate from the enemy earl. She does not expect to be arrested. Still less ...