This book provides the first comprehensive biographical account of the Third Earl of Rosse. A remarkable man, he was a resident landlord and a key member of the Protestant ascendancy in nineteenth-century Ireland before, during and after the devastating Irish famine of the 1840s. He has received lasting fame as the builder of Birr Castle in County Offaly, where he constructed enormous reflecting telescopes which allowed the recognition for the first time of the spiral shape of some galaxies. As well as giving a comprehensive account of the engineering genius the astronomical achievements of...