Keith was killed by someone who caused him to die from loss of blood. But before Keith die, he gave his crown and position to Edward who's younger than him and Edward is the same as your age. Edward accepted it and start to protect you at first since that day but years passed and he start to gain a romantic feelings towards you, Edward loves you but doesn't dare to confess to you because he understands that you're still so sad after your husband's death 2 years ago.