Rus Failge (''fl.'' AD 507–514), also known as Ros Failgeach, was the King of the Uí Failge of what became County Offaly. As the eponymous ancestor of the Uí Failge, he may be the son of the high king of Ireland,

Cathair Mór Cathair Mór ("the great"), son of Feidhlimidh Fiorurghlas, a descendant of Conchobar Abradruad, was, according to Lebor Gabála Érenn, a High King of Ireland. Foras Feasa ar Éirinn, Section 40, page 259, http://www.ucc.ie/celt/published/T100054/ ...

, said to have lived in the early 2 cd century. This is the ancestor listed in the genealogies, though chronologically impossible. The ''Book of Leinster'' king list names an early king Failge Rot mac Cathair. The Uí Failge appear to have had an early leadership among the

Laigin The Laigin, modern spelling Laighin (), were a Gaelic population group of early Ireland. They gave their name to the Kingdom of Leinster, which in the medieval era was known in Irish as ''Cóiced Laigen'', meaning "Fifth/province of the Leinster ...

tribes. This is testified by the early Irish poem ''Timna Cathaír Máir'' ("The Testament of Cathair Mór) where Rus Failge is given the succession to his father. Failge appears as the opponent of

Fiachu mac Néill Fiachu mac Néill (flourished 507–514) was a king of Uisnech in Mide of the Ui Neill dynasty. He was the son of the high king Niall Noígíallach. According to the king list in the ''Book of Leinster'', he succeeded his brother Conall Cremthain ...

of the Ui Neill, founder of the

Cenél Fiachach Cenél is a surname. Notable people with the surname include: *Cenél Conaill, the name of the "kindred" or descendants of Conall Gulban, son of Niall Noígiallach defined by oral and recorded history *Cenél nEógain (in English, Cenel Eogan) is ...

branch. In 507 Fiachu was defeated by Failge at the Battle of Frémainn (Frewin Hill, near Mullingar, County Westmeath). Fiachu had a false prophecy that he would win this battle and desired revenge. In 514 he achieved this revenge by defeating Failge at the Battle of Druim Derg. By this victory the plain of

Mide Meath (; Old Irish: ''Mide'' ; spelt ''Mí'' in Modern Irish) was a kingdom in Ireland from the 1st to the 12th century AD. Its name means "middle," denoting its location in the middle of the island. At its greatest extent, it included all ...

was taken away from the

and Fiachu conquered the territory from Birr to

Uisnech , alternate_name = Ushnagh (anglicisation) , image = Hill of Uisneach.jpg , alt = , caption = Information sign , map = , map_caption = , map_type = island of Ireland , map_alt = A map of Ireland , map_size = , location = ...

in what became County Westmeath.AU 516.1, 517.3; AT 514.3

Notes

References

* ''Annals of Ulster'' a
CELT: Corpus of Electronic Texts
a
University College Cork
* ''Annals of Tigernach'' a

a
University College Cork
* Byrne, Francis John (2001), Irish Kings and High-Kings, Dublin: Four Courts Press, * Charles-Edwards, T. M. (2000), ''Early Christian Ireland'', Cambridge: Cambridge University Press,

of McCarthy's synchronisms at

Trinity College Dublin , name_Latin = Collegium Sanctae et Individuae Trinitatis Reginae Elizabethae juxta Dublin , motto = ''Perpetuis futuris temporibus duraturam'' (Latin) , motto_lang = la , motto_English = It will last i ...

. 6th-century Irish monarchs {{Ireland-royal-stub