Moran's Collar
In an Irish fable, Moran was the chief judge of Feredach the Just, an early king of Ireland before the Christian era. The collar is said to have give warning, by increased pressure around the neck of the wearer, whenever he was about to pronounce an unjust sentence.
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References
Source
- Moore, Th. (1837). The history of Ireland, vol. 1. Paris: Baudry, p. 96.