Question: The site of Lismore Abbey is now occupied by a castle that was rebuilt in the nineteenth century by whom?
Context: Lismore Abbey is a former monastery in Lismore, County Waterford, Ireland, reportedly in its day the most celebrated in the South of Ireland.  Its site is now occupied by Lismore Castle. Świny Castle (Polish: "Zamek Świny"; formerly "Schweinhausburg" in German) - formerly a gord, as a stronghold existed in its location already in the fifth century - securing the Lubawecki mountain pass, the site was recorded in Cosmas' documents from 1108, where the gord is recorded as "Suini in Poloniae".  Possibly, soon after, the gord had been expanded into a military stronghold, at which time it was the seat of the castellans.  The castle was mentioned in Pope Adrian IV's Papal bull.  After the Bolków Castle was constructed, the castle began to lose its significance, this continued up to the nineteenth century, when the castle suffered severe damage due to hurricanes (1762, 1840, 1848, and 1868).  The castle suffered further devastation - it was not until 1931 when the authorities had engaged in securing the castle's ruins.  Currently the castle is privately owned. One of the earliest park systems, in London, came into existence by chance.  As London expanded around former royal parks in the nineteenth century, St. James's Park, Green Park and Hyde Park became part of the urban area.  This arrangement was admired in France and adopted for the nineteenth century re-planning of Paris by Baron Haussmann.  It was also admired by Frederick Law Olmsted and used to create the famous Emerald Necklace in Boston.  Another example is Ebenezer Howard's Adirondack Park concept.  These green networks were part of the nineteenth century Garden City Movement. Mass Castle in Corcelles-les-Arts is fifteenth century castle built in southeast Burgundy region of France.  It has been registered as a historic monument since 1976. This castle, fully restored and inhabited, has square walls with a small tower at each corner, and a classic style interior.  The territory of Corcelles-les-Arts was occupied grape vines that produced a large amount of consumer wine until the late nineteenth century, especially near Mass Castle. Blackwater Castle (Castle Widenham) is a privately owned estate located in the village of Castletownroche between the towns of Mallow and Fermoy in North Cork, Ireland, and since 2005 is available to rent as a private hire venue for castle weddings and private parties along with castle rentals for vacations.  The castle comprises one of the oldest occupied castles in Ireland as parts of the residential section date back to the early 15th century while the castle structure itself dates back to the 12th century.  A round tower on the eastern end of the Castle dating from the late 12th century is still standing although no longer accessible.  The castle was constructed on the ancient fortress of Dun Cruadha, an inland promontory fort dating back to the late Bronze Age/early Iron Age, while the site itself was first occupied back in the Mesolithic age (circa 9,000 years ago) as evidenced by the flint scatter found at Kilcummer and the caves on the south bank of the River Awbeg making this site one of the earliest known settlements in Ireland. Teutonic Castle in Świecie (Polish: "Zamek krzyżacki w Świeciu") - a partial ruin located in Świecie.  The partial ruin is kept in full-shape from the bank of the river Vistula and Wda - together with a circular tower topped with merlons.  The castle is part of a complex built by the Teutonic Knights in the Gothic architectural style.  The castle was built on the site of a Pomeranian dukes' gord - located by the site of the castle.  Formerly the castle had four corner towers, one of which survived.  The castle is surrounded by a defensive wall and a moat.  In 1410 the castle was looted by Polish forces obliterated the castle.  The castle was owned by the Kingdom of Poland after the Second Peace of Thorn in 1466.  In the sixteenth century, Castellan Konopacki reconstructed the castle into the Renaissance architectural style.  The castle was devastated after the Deluge and since then was not rebuilt.  The castle was furthermore devastated after Prussian forces used the castle as training grounds.  Currently the castle houses a museum, with the tower and castle renovated. Schlierbach Abbey (German: "Stift Schlierbach" ) is a Cistercian monastery in Schlierbach, Austria founded in 1355, and rebuilt in the last quarter of the 17th century.  The original foundation was a convent for nuns, abandoned around 1556 during the Protestant Reformation.  The abbey was reoccupied as a monastery in 1620, and rebuilt in magnificent baroque style between 1672 and 1712.  The monastery again went into decline with the upheavals before, during and after the Napoleonic era.  It recovered only towards the end of the 19th century.  In the 20th century the abbey established a viable economy based on a glass works, school, cheese manufacturing and other enterprises.  The abbey is open to visitors, who may take tours, attend workshops and dine at the monastery restaurant. The Abbot of Lismore (Irish: "Lios Mór" ; Latin: "Lismorensis" ) was the head of Lismore Abbey, which is in modern-day County Waterford, Ireland. Lismore Castle (Irish: "Caisleán an Leasa Mhóir" ) is the Irish home of the Duke of Devonshire.  Located in the town of Lismore in County Waterford in Ireland, it belonged to the Earls of Desmond, and subsequently to the Cavendish family from 1753.  It was largely re-built in the Gothic style during the mid-nineteenth century by William Cavendish, 6th Duke of Devonshire. Gregynog (] ) is a large country mansion in the village of Tregynon, 4 miles (6 km) northwest of Newtown in the old county of Montgomeryshire, now Powys in mid Wales.  There has been a settlement on the site since the twelfth century.  From the fifteenth to the nineteenth century it was the home of the Blayney and Hanbury-Tracy families.  In 1960 it was transferred to the University of Wales as a conference and study centre by Margaret Davies, granddaughter of the nineteenth century industrial magnate and philanthropist, David Davies 'Top Sawyer' of Llandinam.
Answer: William Cavendish, 6th Duke of Devonshire