Nuadu Necht son of Sétna Sithbac, a descendant of Crimthann Coscrach

Crimthann Coscrach

Crimthann Coscrach , son of Fedlimid Fortrén, son of Fergus Fortamail, was, according to medieval Irish legend and historical tradition, a High King of Ireland. He took power after killing his predecessor, Énna Aignech, and ruled for four or seven years, after which he was killed by Rudraige mac...

, of the Laigin

Leinster

Leinster is one of the Provinces of Ireland situated in the east of Ireland. It comprises the ancient Kingdoms of Mide, Osraige and Leinster. Following the Norman invasion of Ireland, the historic fifths of Leinster and Mide gradually merged, mainly due to the impact of the Pale, which straddled...

, was, according to medieval Irish legend and historical tradition, a High King of Ireland

High King of Ireland

The High Kings of Ireland were sometimes historical and sometimes legendary figures who had, or who are claimed to have had, lordship over the whole of Ireland. Medieval and early modern Irish literature portrays an almost unbroken sequence of High Kings, ruling from Tara over a hierarchy of...

. He came to power after killing his predecessor, Eterscél, and ruled for six months, at the end of which he was killed by Eterscél's son Conaire Mór

Conaire Mor

Conaire Mór , son of Eterscél, was, according to medieval Irish legend and historical tradition, a High King of Ireland. His mother was Mess Búachalla, who was either the daughter of Eochu Feidlech and Étaín, or of Eochu Airem and his daughter by Étaín...

.

The Lebor Gabála Érenn

Lebor Gabála Érenn

Lebor Gabála Érenn is the Middle Irish title of a loose collection of poems and prose narratives recounting the mythical origins and history of the Irish from the creation of the world down to the Middle Ages...

synchronises his reign with that of the Roman emperor

Roman Emperor

The Roman emperor was the ruler of the Roman State during the imperial period . The Romans had no single term for the office although at any given time, a given title was associated with the emperor...

 Augustus

Augustus

Augustus ;23 September 63 BC – 19 August AD 14) is considered the first emperor of the Roman Empire, which he ruled alone from 27 BC until his death in 14 AD.The dates of his rule are contemporary dates; Augustus lived under two calendars, the Roman Republican until 45 BC, and the Julian...

 (27 BC - AD 14), and after the birth of Christ

Christ

Christ is the English term for the Greek meaning "the anointed one". It is a translation of the Hebrew , usually transliterated into English as Messiah or Mashiach...

, and makes him contemporary with legendary provincial kings Conchobar mac Nessa

Conchobar mac Nessa

Conchobar mac Nessa was the king of Ulster in the Ulster Cycle of Irish mythology. He ruled from Emain Macha .-Birth:...

, Cairbre Nia Fer

Cairbre Nia Fer

Cairbre Nia Fer , son of Rus Ruad, was, according to medieval Irish legend and historical tradition, a King of Tara from the Laigin....

 and Ailill mac Máta

Ailill mac Máta

Ailill mac Máta is the king of the Connachta and the husband of queen Medb in the Ulster Cycle of Irish mythology. He rules from Cruachan .-Family background, marriage and offspring:...

. The chronology of Geoffrey Keating

Geoffrey Keating

Seathrún Céitinn, known in English as Geoffrey Keating, was a 17th century Irish Roman Catholic priest, poet and historian. He was born in County Tipperary c. 1569, and died c. 1644...

's Foras Feasa ar Éireann dates his reign to 64-63 BC, that of the Annals of the Four Masters

Annals of the Four Masters

The Annals of the Kingdom of Ireland or the Annals of the Four Masters are a chronicle of medieval Irish history...

to 111-110 BC. The Four Masters combine his reign with that of Ér, Orba, Ferón and Fergna

Ér, Orba, Ferón and Fergna

Ér, Orba, Ferón and Fergna, sons of Éber Finn, were, according to medieval Irish legends and historical traditions, joint High Kings of Ireland for half a year after they killed their cousins Luigne and Laigne, sons of Érimón, in the Battle of Árd Ladrann. They were soon killed by Érimón's son...

 centuries before, to make a whole year in their chronology.

In the Fenian Cycle

Fenian Cycle

The Fenian Cycle , also referred to as the Ossianic Cycle after its narrator Oisín, is a body of prose and verse centering on the exploits of the mythical hero Fionn mac Cumhaill and his warriors the Fianna. It is one of the four major cycles of Irish mythology along with the Mythological Cycle,...

 he is the great grandfather of Fionn mac Cumhaill

Fionn mac Cumhaill

Fionn mac Cumhaill , known in English as Finn McCool, was a mythical hunter-warrior of Irish mythology, occurring also in the mythologies of Scotland and the Isle of Man...

: his son is the druid Tadg mac Nuadat

Tadg mac Nuadat

Tadg, son of Nuada, was a druid and the maternal grandfather of Fionn mac Cumhail in the Fenian Cycle of Irish mythology. It is unclear whether his father was the short-lived High King Nuada Necht, the god Nuada Airgetlam of the Tuatha Dé Danann, or another figure of a similar name...

, whose daughter, Muirne

Muirne

Muirne or Muireann Muncháem was the mother of Fionn mac Cumhail in the Fenian Cycle of Irish mythology.She had many suitors, but her father, the druid Tadg mac Nuadat, had foreseen that her marriage would lead to the loss of his home on the hill of Almu, so he refused them all. But one of them,...

, is Fionn's mother. It is suggested that he is connected to the presumed deities

Deity

A deity is a recognized preternatural or supernatural immortal being, who may be thought of as holy, divine, or sacred, held in high regard, and respected by believers....

 (or possibly two names for one deity) Nuada Airgetlám and Nechtan

Nechtan

Nechtan, Nectan or Neithon may refer to:Kings:* Nechtan Morbet , king of the Picts* Nechtan nepos Uerb , king of the Picts* Nechtan mac Der-Ilei , king of the Picts...

 of the Tuatha Dé Danann

Tuatha Dé Danann

The Tuatha Dé Danann are a race of people in Irish mythology. In the invasions tradition which begins with the Lebor Gabála Érenn, they are the fifth group to settle Ireland, conquering the island from the Fir Bolg....

.