The scandalous debauchery of the playboy tenth Earl of Shaftesbury sent seismic shock waves through the British aristocracy. One of the richest men in the country and master of a Downton Abbey-style dynasty, he abandoned his loyal wife and two sons for a depraved life of drunken orgies, cocaine and bed-hopping with Continental whores. His riotous romp plumbed the depths when he divorced the mother of his children to marry a foreign prostitute, installing...