The 6th Duke (1790–1858), commonly known as 'the Bachelor Duke', was responsible for the castle's present appearance. He began transforming the castle into a fashionable 'quasi-feudal ultra-regal fortress' as soon as he succeeded his father in 1811, engaging the architect William Atkinson from 1812 to 1822 to rebuild the castle in the Gothic style, using cut stone shipped over from Derbyshire. Lismore was always the Bachelor Duke's favourite residence, but as he grew older his love for the place developed into a passion. In 1850 he engaged his architect Sir Joseph Paxton, the designer of The Crystal Palace, to carry out improvements and additions to the castle on a magnificent scale – so much so that the present skyline is largely Paxton's work. At this time, J.G. Crace of London, the leading maker of Gothic Revival furniture, and his partner, the leading architect A.W.N. Pugin, were commissioned to transform the ruined chapel of the old Bishop's Palace into a medieval-style banqueting hall, with a huge perpendicular stained-glass window, choir-stalls and Gothic stenciling on the walls and roof timbers. The chimney-piece, which was exhibited at the Medieval Court of the Great Exhibition of 1851, was also designed by Pugin (and Myers) but was originally intended for Horsted Place in Sussex; it was rejected because it was too elaborate and subsequently bought for Lismore – the Barchard family emblems later replaced with the present Irish inscription "Cead Mille Fáilte": 'a hundred thousand welcomes'. Pugin also designed other chimney-pieces and furnishings in the castle and, after his death in 1851, Crace continued to supply furnishings in the Puginesque manner.