On Christmas Day 1013, Danish ruler Sweyn Forkbeard was declared King of all England and the town of Gainsborough its capital. But why is so little known of the man who would be England's shortest-reigning king and the role he played in shaping the early history of the nation? For 20 years, Sweyn, a "murderous character" who deposed his father Harold Bluetooth, waged war on England. And exactly 1,000 years ago, with his son Canute by his side, a large-scale invasion finally proved decisive. It was a brutal time, which saw women burned alive, children impaled on lances and men...