Originating in the decorative sculptures worn by knights in tournaments and, to a lesser extent, battles, crests became solely pictorial after the 16th century (the era referred to by heraldists as that of "paper heraldry").
A normal heraldic achievement consists of the shield, above which is set the helm, on which sits the crest, its base encircled by a circlet of twisted cloth known as a torse.
[1] Crests had existed in various forms since ancient times: Roman officers wore fans of feathers or horsehair, which were placed longitudinally or transversely depending on the wearer's rank,[2] and Viking helmets were often adorned with wings and animal heads.
The fan crest was later developed by cutting out the figure displayed on it, to form a metal outline; this evolved in the late 13th and early 14th centuries into a three-dimensional sculpture.
[5] These were usually made of cloth, leather or paper over a wooden or wire framework,[6] and were typically in the form of an animal; also popular were wings, horns, human figures, and panaches of feathers.
These were probably worn only in tournaments, not battle: not only did they add to the already considerable weight of the helm, they could also have been used by opponents as a handle to pull the wearer's head down.
[7] Laces, straps, or rivets were used to affix the crest to the helm,[8] with the join being covered by a circlet of twisted cloth known as a torse or wreath, or by a coronet in the case of high-ranking nobles.
[17] After the 16th century, it became common for armigers to detach the crest and wreath from the helm, and use them in the manner of a badge, displayed on crockery, carriage doors, stationery, etc.
The standard form is a simplified ducal coronet, consisting of three fleurons on a golden circlet; these are not, however, indications of rank, though they are not generally granted nowadays except in special circumstances.