Ireland’s Lismore Castle, built in 1185 on the site of a seventh-century monastery, lays claim to being one of the most romantically sited places in a country where myth and magic lurk at every turn. The castle crests a craggy hill commanding a view of a bright, rain-fed green valley, while in the distance, the mist-shrouded Knockmealdown Mountains loom. Sir Walter Raleigh was once a tenant, and Robert Boyle, heralded as the “father of modern chemistry,” was born here in 1627, but the castle’s destiny changed in the mid–18th century, when it was included in the dowry that the fabulously wealthy Lady Charlotte Boyle brought to her marriage with the Marquess of Hartington, future fourth Duke of Devonshire.
It was their grandson, the sixth “Bachelor Duke,” a great collector, builder,…