The Rise of English Unity.

The empire of the Carolingians began to decline after the monarchy of Louis the Pious (814–840), but its artistic influence was felt for centuries to come, often far outside its borders. England, settled by the Germanic tribes known as Angles and Saxons, developed a political model of sacred kingship that was based on Old Testament precedents and that was dependent upon the official sanction of Christian churchmen, just as Carolingian kingship had been. This early medieval notion of sacred kingship implied that the authority of the church was exercised through the person of the king or emperor, whose claim to both political and religious authority was based on the precedent of the Old Testament kings and, more recently, the Frankish (or Carolingian) emperors of Rome. It was an accommodation between spiritual and temporal authority that served the interests...