Derryquin Castle was an 18th-century stone-built country house, now demolished, in the Parknasilla estate in Sneem, County Kerry in the Republic of Ireland. It stood on the Ring of Kerry route some 40 km (25 miles) south-west of Killarney.
Designed by local architect James Franklin Fuller, the house comprised a three storey main block with a four storey octagonal tower rising through the centre and a two storey, partly curved wing. The building was equipped with battlements and machiolations.
The Parknasilla estate was acquired by an Englishman the Very Reverend James Bland, who had moved to Ireland in 1692 as chaplain to Henry Sydney, 1st Earl of Romney, the newly appointed Lord Lieutenant of Ireland and in 1727 had been appointed Dean of Ardfert. He sold his Yorkshire properties in 1717 and was the person who probably commissioned Fuller to build Derryquin. On his death the property passed to his son, the Rev Francis Bland, who left it in turn for his son Francis Christopher Bland (1770–1838), High Sheriff of Kerry for 1806. From him it passed to his son James Franklin Bland (1799–1863), who was High Sheriff of Kerry for 1835. He was succeeded by Francis Christopher Bland (1826–1899), High Sheriff in 1859, and he by James Franklin Bland (1850–1927).
In 1891 the latter sold the castle to the Warden family, who lived there until 1922, when it was burnt down by the Irish Republican Army, one of nearly 40 historic houses in Ireland to suffer the same fate. It was owned at the time by Colonel Charles Wallace Warden.
The building was demolished in 1969. The site of the building now lies within the grounds of the Parknasilla Resort Hotel, which the Bland family also built in the 1890s.
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