Well the first book in the Devil's Riders series, Called "The Stolen Princess" by Anne Gracie excellent, it's the first book in a series, and Anne Gracie is one of my go-to's. (the first book is the Princess book, the others are pretty much standard Regency/historical-- men are related to the groom, or are best friends with him and find love as well)

Then there is the Lost Princesses Series by Christina Dodd, which is also pretty amazing.