The Horse and his boy

About a month ago, I read a book called 'The horse and his boy': the third book on 'the chronicles of Narnia'. This book begins with a boy named Shasta, who was adopted and raised by a fisherman in Calormene (a world seperated to narnia by Aslan). One day, a Carlormene nobleman came and Shasta overhears his father talking about selling him. A talking horse from narnia: Bree comes and tells to flee with him to Narnia, a place where animals talk. The pair meets another pair: Aravis and Hwin. Aravis is running away because she didn't want to marry Ahosta, a 60-year old man who 'looks like an ape'. Shasta and Bree got found by a couple of Narnarians who mistaken him for prince Corin. Shasta hears their plans to escape from Carlomen to prevent a marrige between Queen susan and Rabadash (son of Tisroc{king of Carlomen}). Meanwhile, She overhears Tisroc discussing about a siege that they're going to make to capture queen Susan. Then, they came to Archenland to warn them about the siege. When the Calormens came, they successfully defended queen Susan and Captured Rabadash. Next, Aslan comes and transforms Rabadash into a donkey. Aslan had declared that He could acheive his true form if he goes to the altar, But, If he's 10 miles away from the temple, He'll turn into a donkey again. After that happened, King Lune (king of archenland) recognized Shasta as Cor, lost twin of Corin. Finally, Shasta (or Cor) becomes the king of Archenland and marries Aravis.