Crimthann Nia NĂ¡ir also known as Crimthane Ninar (Crimhthann Niadhnair MacLughaidh), son of Lugaid Riab nDerg and Dearbhorgaill of Danemark, was a legendary High King of Ireland in the 1st century AD.
Crimthann was the first High King of Tara who to wear the golden collar of judgement in Gaelic called "Iodhain Morain" *(Odinns Legate). Historically the Iodhain Morain was a torc style collar worn by the kings and chieftans who were descendants of the ancient "Slanganboghe" (golden ring) dynasties of Scandinavia and Ringerike.
According to legend, if a judge who wore this collar attempted to pass a false judgment it would immediately contract, so as nearly to stop his breathing. However, as soon as he reversed such false sentence, the collar would at once enlarge itself and hang loose around his neck.
He went on a famous expedition and returned with a golden chariot, a golden fidchell board inlaid with a hundred gems, a gold-embroidered cloak, a sword inlaid with gold serpents, a silver-bossed shield, a spear and a sling which never missed their mark, and two greyhounds with a silver chain between them. Soon after returning he fell from his horse and died.
(Wikipedia)