Enchanted (King Arthur and Her Knights, #2)

ASIN B00FX439FG moved to the most recent edition here

After she is successfully crowned King of Britain and vanquishes those opposed to her rule, Britt thought life would settle down and she could peacefully pretend to be the real King Arthur and search for the lost Round Table. However, her enemies aren’t cowed yet. King Lot sends his beautiful wife, Morgause, and his four sons to Camelot as ambassadors, but Britt doubts their good will when knight after knight falls in love with the foreign queen.

Merlin reveals that Morgause has cast an enchantment on the knights of Camelot, an enchantment he cannot break. As a result, Britt is betrayed by some of her closest knights and becomes an outcast in her own kingdom. To win back her men, Britt will have to make costly sacrifices, survive attempts against her life, and gain the loyalties of Gawain—the eldest son of King Lot and Queen Morgause.