When Eustace Scrubb and Jill Pole arrive in Narnia, they discover that Caspian and his wife have had a son, Rilian, and that 10 years before they arrived, the Queen had been killed by a great serpent while picnicking with friends.
Rilian returned to the scene of his mother's death many times over the following weeks, once with Lord Drinian, where they both caught a glimpse of a beautiful woman that Rilian had previously seen.