David I was never expected to become king, but on succeeding to the Scottish throne in 1124 he quickly demonstrated that he had the skills, ruthlessness and ambition to become one of the kingdom's greatest rulers. Drawing on the experiences and connections of his youth spent at the court of his brother-in-law, Henry I of England, and moulded by the dominant personality and intense piety of his mother, St Margaret, he set out to transform his inheritance...