Tigernach mac Fócartai (died 865), also called Tigernach of Lagore, was King of Lagore.
Tigernach belonged to the Uí Chernaig branch of the once-powerful Síl nÁedo Sláine kindred, part of the southern Uí Néill. His great-great-grandfather Fogartach mac Néill had been High King of Ireland. The kingdom of Brega over which the Síl nÁedo Sláine had once ruled was, by the middle of the eighth century, divided into two or more parts. The Uí Chernaig were styled kings of Lagore, or of south Brega, named after Loch Gabhair in modern County Meath. Archaeological study of the crannog in Loch Gabhair suggests that the seat of the kings of Lagore was there. The Hill of Tara lay within the kingdom of Lagore, and this may have given the otherwise minor kingdom a somewhat greater importance.
During Tigernach's reign the Irish midlands were dominated by his distant Uí Néill kinsman, the High King Máel Sechnaill mac Máele Ruanaid of Clann Cholmáin. The earliest record of Tigernach may be his defeat of Máel Sechnaill and the King of Leinster Ruarc mac Brain in 846.
In 848, probably as part of a broad alliance of Irish kings, Tigernach gained a victory over Vikings at Dísert Do-Chonna, an unidentified location, probably near the coast in the east midlands of Ireland. Vikings, however, were not the main threat to Tigernach. That came from his kinsmen in north Brega, the ambitious Cináed mac Conaing and his brother Flann.
Cináed, who became king of north Brega in 849, allied with Vikings in 850 and, according to the Annals of Ulster , "plundered the Uí Néill from the Shannon to the sea". He attacked the crannog at Loch Gabair, which was burned, as was the nearby church at Trevet with seventy people inside. The Annals of Ulster record Tigernach's revenge. Cináed met with Máel Sechnaill and Tigernach the following year where, in spite of promises of safe conduct guaranteed by the church, he was betrayed and "cruelly drowned in a pool by Máel Sechnaill and Tigernach".
The Irish annals record a battle between Flann and Tigernach in 854, at Domnach Mór (Donaghmore in modern County Laois) where Flann had the best of it. Nothing further is reported of Tigernach until his death in 865. His obituary calls Tigernach king of Lagore ( rí Locha Gabor) and co-king of Brega (lethrí Breg).
The Ó Tighearnaigh/Tierney family of County Meath claim descent from Tigernach.
Domhnall Mac Murchada, called Domnall Midi, was High King of Ireland. He belonged to the Clann Cholmáin branch of the Uí Néill. Clann Cholmáin's pre-eminence among the southern Uí Néill, which would last until the rise of Brian Bóruma and the end of the Uí Néill dominance in Ireland, dates from his lifetime.
Flann Sinna, also known as Flann mac Máel Sechnaill, was the son of Máel Sechnaill mac Máele Ruanaid of Clann Cholmáin, a branch of the Southern Uí Néill. He was King of Mide from 877 onwards and is counted as a High King of Ireland. His mother Land ingen Dúngaile was a sister of Cerball mac Dúnlainge, King of Osraige.
Síl nÁedo Sláine are the descendants of Áed Sláine, son of Diarmait mac Cerbaill. Part of the Southern Uí Néill—they were the kings of Brega—they claimed descent from Niall Noígiallach and his son Conall Cremthainne.
Máel Sechnaill mac Máel Ruanaida, also known as Máel Sechnaill I, anglicised as Malachy MacMulrooney was High King of Ireland. The Annals of Ulster use the Old Irish title rí hÉrenn uile, that is "king of all Ireland", when reporting his death, distinguishing Máel Sechnaill from the usual Kings of Tara who are only called High Kings of Ireland in late sources such as the Annals of the Four Masters or Geoffrey Keating's Foras Feasa ar Éirinn. According to the "Grand History of the Celts", a traditional book of facts and folklore, Mael Sechnaill was the husband of Mael Muire, the granddaughter of the legendary Alpin, a 9th-century king of Dalriada.
The Kings of Brega were rulers of Brega, a petty kingdom north of Dublin in medieval Ireland.
Cináed mac Írgalaig or Cináed Cáech, "the one-eyed", was an Irish King of Brega who was High King of Ireland.
Fogartach Mac'Artain, sometimes called Fogartach ua Cernaich, was an Irish king who is reckoned a High King of Ireland. He belonged to the Uí Chernaig sept of the Síl nÁedo Sláine branch of the southern Uí Néill. He was King of Brega and was the son of Niall mac Cernaig Sotal and great-grandson of the high king Diarmait mac Áedo Sláine.
Cináed mac Conaing was King of Knowth in the medieval Irish province of Mide, succeeding his father Conaing mac Flainn in 849.
Diarmait was a son of Áed Sláine. According to the Irish annals, he was High King of Ireland.
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Flann mac Áedo was a King of Fir Cúl in Brega of the Síl nDlúthaig sept of the Síl nÁedo Sláine of Brega. He was the son of Áed mac Dlúthaig, King of Fir Cúl and great-grandson of Ailill Cruitire mac Áedo Sláine, a king of Brega.
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Fogartach mac Cummascaig was King of South Brega of the Uí Chernaig sept of Lagore of the Síl nÁedo Sláine branch of the southern Ui Neill. He was the grandson of the high-king Fogartach mac Néill. He ruled from 785 to 786.
Events from the 7th century in Ireland.
Cernach mac Fergusa was a King of in South Brega of the Uí Chernaig sept of Lagore of the Síl nÁedo Sláine branch of the Southern Uí Néill. He was the son of Fergus mac Fogartaig and brother of Máel Dúin mac Fergusa and Ailill mac Fergusa, previous kings.
Events from the 8th century in Ireland.
Events from the 9th century in Ireland.