In the 1st century AD, for the first time, several fibula designs originated in Roman Britain. Perhaps the most distinctive British fibula design was the Dolphin. This was actually a series of designs including the Polden Hill type, the Langton Down type, the Colchester type and the T-Shaped type. Dolphin fibulae have a smooth arched bow that tapers from the head to end in a long point. The long bilateral spring is covered. From the top the Dolphin fibula looks like a T or the late-Roman crossbow fibula. From the side it resembles a leaping dolphin.