Brooch
Brooches or fibulae are possibly the oldest type of jewelry. When man first took to wearing something more than a loin cloth, there emanated the need of holding the cloth together. The thorn was maybe the first of these pins, with pins of other material, like flint, found in the caves of the Paleolithic age. Pins of bronze were in regular use during the Bronze Age.
There are several distinct types of brooches, not only in design, but in the binding mechanism. The initial known of these was the "safety-pin" form. Those brooches had a pin, hinge, spring and bow all in one place. If a brooch is not a bow shaped, however round it is called "annular". A "discoidal" brooch has a solid plaque or ornamental face with a plain pin and hook in the back. The "pen annular" pin was developed by the Celts and had a hole in the ring.
The original roman brooch was the spina, which was a thorn or something like a thorn. Then, along with the Greeks and Etruscans, the Romans used a safety-pin type approximately exclusively. Before the Romans higher to Britain, the populace of the British Isles wore fibulae of one piece. The typical harp shape of the later Britons only came into being through the Romano British period.