King John is one of those historical characters who needs little in the way of introduction. If readers are not already familiar with him as the tyrant whose misgovernment gave rise to Magna Carta, we remember him as the villain in the stories of Robin Hood. Formidable and cunning, but also cruel, lecherous, treacherous and untrusting. Twelve years into his reign, John was regarded as a powerful king within the British Isles.