Peace has been established in the three years since then, and Caspian has undertaken a quest in fulfilment of his coronation oath to sail east for a year and a day and find the seven lost Lords of Narnia: Argoz, Bern, Mavramorn, Octesian, Restimar, Revilian, and Rhoop. He mentions that Trumpkin the dwarf has been left in charge of Narnia as Lord Regent in his absence. Lucy and Edmund are delighted to be back in the Narnian world, but Eustace is less enthusiastic, as he has never been there before and had taunted his cousins with his belief that this alternate universe had never existed. The Talking Mouse Reepicheep is also on board, as he hopes to find Aslan's Country beyond the seas of the "utter East". When Eustace teases Reepicheep, much is revealed about the mouse's pugnacious character.