"A disc fibula or disc brooch is a type of fibula, that is, a brooch, clip or pin used to fasten clothing that has a disc-shaped, ...
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often richly decorated plate or disc covering the fastener. The terms are mostly used in relation to the Middle Ages of Europe, especially the earlier part of the period. They were the most common style of Anglo-Saxon brooches.
In Scotland, where the need for a fastening at the shoulder lasted into the Renaissance and beyond, a type of silver "turreted" brooch for men was still being made in the 16th century and later. The Brooch of Lorn is the best-known example." - (en.wikipedia.org 26.09.2019)
