‘About half-past two o’clock on Tuesday morning, Blackrock Castle was observed to be on fire, and in a few minutes presented a very imposing sight. The waters were illuminated, and the surrounding hills completely lit, presenting more the appearance of noon-day than of a dark night. Immediately after the cupola blazed with the greatest splendour, the heavy leads caught fire and sent to the river a liquid body of burning lead, the concussion between the red-hot lead and water sending forth a crash resembling the noise of artillery; the rain which fell about the time on the burning lead roof, yielding a noise like the fire of musketry. The whole presented a grand and awful sight, and continued burning with unabated fury for upwards of three hours. The roof has completely disappeared, and the timbers in the wall were burning this morning at seven o’clock. Fortunately, the inmates escaped unhurt. Had the wind been in another direction, the surrounding houses would probably have been destroyed. The fire is supposed to have been caused by a slate having broken the glass of the river light which is kept on Blackrock Castle for the use of ships, and the fire caught the roof.’
Dublin Morning Register, March 2nd 1827.
Located on a limestone outcrop in the river Lee to the immediate east of Cork city, Blackrock Castle was originally built in the early 1580s and maintained by the local burghers according to a contemporary document, ‘to resist pirates and other invasion’ (it should be remembered that as late as 1631, the coastal village of Baltimore, further to the west was sacked by pirates and more than 100 of its residents carried off into slavery in Algiers). The first castle was little more than a watch tower which also served to help guide ships into Cork harbour. However, in the early 17th century, Ireland’s Lord Deputy Charles Blount, Lord Mountjoy caused the building to be enlarged and reinforced, with walls over seven feet thick and the main circular tower having a diameter of some 34 and a half feet. Returned by James I to the citizenry of Cork in 1608, this structure held artillery intended to repel any would-be invaders venturing up the river. In 1722, the castle was damaged by fire and, according to Charles Smith’s Ancient and Present State of the County and City of Cork (1750), the corporation spent £296 refurbishing the building, this work including the creation of ‘a very handsome octagon room, from whence is a delightful prospect of the harbour, from Passage to Cork.’ Here, according to Smith, ‘the mayors of Cork hold an admiralty court, being, by several charters, appointed admirals of the harbour.’ In addition, on the first day of August each year, the mayor and corporation held an ‘entertainment’ in the building, ‘at the charge of the city.’ Such remained the case until February 27th when a serious fire, as described above in the Dublin Morning Register, largely destroyed the old castle.
In December 1827, Cork Corporation voted a sum of £800, and the Harbour Commissioners a further £200 towards the cost of rebuilding Blackrock Castle. The job was entrusted to architect siblings James and George Pain, both pupils of John Nash, who had each come to Ireland during the previous decade and established thriving practices. As designed by the Pains and completed within two years, Blackrock Castle looks like a medieval fortress, its dominant feature being a large circular tower to which is attached a much more slender and somewhat taller turret: the latter continued to have navigation lights on its roof to aid shipping. Around the tower, a series of battlemented walls enclose a courtyard, helping to confirm the image of a romantic gothic castle. Despite being described in the Journal of the Cork Historical and Archaeological Society in 1914 as ‘one of the prettiest and most striking objects to be seen on the river Lee’, the building thereafter suffered from neglect for much of the last century,. It was leased to a professor of botany in the 1930s and then sold in the 1960s to a group of local businessmen, after which it served as a bar, a restaurant, commercial offices and, for one period, as a private residence. In 2001 Blackrock Castle was bought back by Cork Corporation for IR£825,000 and a programme of restoration was undertaken. For almost 20 years, the building has housed an observatory run by Munster Technological University and laboratories staffed by astronomical researchers from the same institution. Although open to the public and hosting exhibitions, because the castle always served practical purposes, internally there is little of decorative interest, other than a fine limestone chimneypiece from the second quarter of the 17th century and originally in a since-demolished house called Ronayne’s Court. Better to rejoice in the handsome exterior, with the waters of the river Lee washing against a sequence of towers and turrets.
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