The Hanoverian succession of 1714 brought about a 123-year union between Britain and the German electorate of Hanover, ushering in a distinct new period in British history. Under the four Georges and William IV Britain became arguably the most powerful nation in the world with a growing colonial Empire, a muscular economy and an effervescent artistic, social and scientific culture. And yet history has not tended to be kind to the Hanoverians, frequently portraying them as petty-minded and boring monarchs presiding over a dull and inconsequential court, merely the puppets of parliament and...