The Splendor Hyaline was the royal galleon of Narnia during its Golden Age.
The ship had a carved swan's head at her prow, with huge wings reaching back almost to her waist. It was also decorated with silken sails and great stern lanterns. Nevertheless, she was also fast and equipped for battle, so that she could have out-run or sunk any ship owned by contemporary Calormen.
For a fuller explanation of these events, see The Horse and His Boy.