 When Caspian learns that the island's government has become corrupt (not least by legalising slave trade), he uses his official standing as Emperor(duke)of the Lone Islands to appoint Lord Bern as Duke of the Lone Islands, ousting Governor Gumpus and dismissing his followers.Lord Bern remains on Doorn, in the city Narrowhaven (Voyage of the Dawn Treader, chp.4) when the crew set sail again, now in a position (Duke of the Lone Islands) to restore order to the islands.