Purchasing and reading guidebooks became an increasingly important part of visiting castles; by the 1820s visitors could buy an early guidebook at Goodrich outlining the castle's history, the first guidebook to the Tower of London was published in 1841 and Scottish castle guidebooks became well known for providing long historical accounts of their sites, often drawing on the plots of Romantic novels for the details. Indeed, Sir Walter Scott's historical novels "Ivanhoe" and "Kenilworth" helped to establish the popular Victorian image of a Gothic medieval castle. Scott's novels set in Scotland also popularised several northern castles, including Tantallon which was featured in "Marmion". Histories of Ireland began to stress the role of castles in the rise of Protestantism and "British values" in Ireland, although tourism remained limited.