Trefoil brooches are based on war booty brought back from the Franks! They were original Frankish sword holder fittings, w=but were soon adapted to use on Viking Apron dresses! - 3 cm, from a Russian Find
Viking Thistle Brooch 9th - 11th Century Rich distinctive detail 4" Diameter 6" Pin his page contains a collection of handcrafted Museum Replica Penannular Style Brooches as well as Oval Brooches, Trefoil Brooches, Disk Brooches, Roscrea Brooches and Fibulae in Silver and Bronze. At the bottom of this page, you can find various Clasps and Pins.