According to the Lebor Gabála Érenn he became king when he overthrew his predecessor Conmáel in the Battle of Óenach Macha, and within a year of his accession had won twenty-seven battles against the descendants of Eber Finn, almost completely destroying Eber's line. It is said that during his reign gold was first smelted in Ireland, by the wright Iuchadán. Tigernmas was the first king to give drinking-horns to his followers, and the first to have clothes dyed purple, blue and green and decorated with brooches, fringes and ornaments. Seven lakes and three rivers burst from the ground during his reign. After reigning for seventy-seven years (or 100 years according to the Book of Fenagh, P 23), he and three-quarters of the men of Ireland died on Magh Slécht while worshipping Crom Cruach, a cruel deity propitiated with human sacrifice. According to the Annals of the Four Masters, Ireland was without a High King for seven years after his death, before Eochaid Étgudach took the kingship.
The Lebor Gabála synchronises his reign with the deaths of Thineas and Decylas, kings of Assyria, and the reigns of David and Solomon in Israel; the Laud Synchronisms with the Judean kings Asa and Jehoshaphat and the Assyrian king Pertiades (Pyriatides) 985 B.C. The Annals of the Four Masters dates his reign to 1621–1544 BC; Geoffrey Keating to 1209–1159 BC.
| High King of Ireland
AFM 1621–1544 BC
FFE 1209–1159 BC
- Also spelled Tigernmais, Tigernmus, Tighearnmhas etc.
- R. A. Stewart Macalister (ed. & trans.), Lebor Gabála Érenn: The Book of the Taking of Ireland Part V, Irish Texts Society, 1956, pp. 198-209
- E. Gwynn (ed & trans), The Metrical Dindshenchas Vol. 3 poem 50, Vol. 4 poem 7
- John O'Donovan (ed. & trans.), Annala Rioghachta Éireann: Annals of the kingdom of Ireland by the Four Masters, Dublin, 1848-1851, Vol. 1 p. 39-44
- D. Comyn & P. S. Dinneen (ed .& trans.), The History of Ireland by Geoffrey Keating, Irish Texts Society, 1902-1914, Book 1 Chapter 25
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