Orders of knighthood and chivalry have existed since the Middle Ages, when they were intended to unite important noblemen in bonds of loyalty to their monarch, and act as impressive rewards for their services. They have survived into modern times as a means of rewarding people of all classes and occupations for their contributions at international, national, or local levels. Peter Duckers introduces the insignia of such orders, ranging from the 'Great Orders' of the Garter and the Thistle, to the Order of the British Empire. The insignia worn by the various ranks within the Orders are often of the highest quality and, like campaign medals and decorations, have become a popular area for collecting and research.