The Constant Flame — Patricia Phillips

Facing the likelihood of an arranged marriage, Jessamyn Dacre, Lady of Curlew, vowed she would remain independent rather than find herself betrothed to someone she didn't love. Surely somewhere out there was a man as romantic and tender as those she had dreamt about. And then she met Rhys of Trevaron, and her heart was irretrievably lost.
The dashing Welshman was everything she had ever hoped for, and in his arms she found a passion like none she had ever imagined. But their bliss would be short-lived. For even as civil war threatened to tear their land apart, wicked forces conspired to destroy the young couple's happiness. Battered and betrayed at every corner, Jessamyn and Rhys would have to cling to their newfound love as they sought to make a life together against the odds.