The impact on England of William's conquest was profound; changes in the Church, aristocracy, culture, and language of the country have persisted into modern times. The Conquest brought the kingdom into closer contact with France and forged ties between France and England that lasted throughout the Middle Ages. Another consequence of William's invasion was the sundering of the formerly close ties between England and Scandinavia. William's government blended elements of the English and Norman systems into a new one that laid the foundations of the later medieval English kingdom. How abrupt and far-reaching the changes were, is still a matter of debate among historians, with some such as Richard Southern claiming that the Conquest was the single most radical change in European history between the Fall of Rome and the 20th century. Others, such as H. G. Richardson and G. O. Sayles, see the changes brought about by the Conquest as much less radical than Southern suggests. The historian Eleanor Searle describes William's invasion as "a plan that no ruler but a Scandinavian would have considered".