The history of the English fiscal system affords the best known example of continuous financial development in terms of both institutions and methods. Although periods of great upheaval occurred from the time of the Norman Conquest to the beginning of the 20th century, the line of connection is almost entirely unbroken. Perhaps the most revolutionary changes occurred in the 17th century as a result of the Civil War and, later, the Glorious Revolution of 1688; though even then there was no real breach of continuity.