Eochaidh Ua Floinn was an Irish poet who held the post of Chief Ollam of Ireland

Chief Ollam of Ireland

The Ollamh Érenn or Chief Ollam of Ireland was a professional title of Gaelic Ireland.-Background:An ollam was a poet or bard of literature and history. Each chief or tuath had its own ollam...

. He died in 984 AD.
His poems are preserved in the Book of Lecan, 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...

 and other manuscripts and include poems on the different invasions of Ireland. Edward O'Reilly

Edward O'Reilly

Edward O'Reilly was an Irish scholar in the first half of the 19th century.His grandfather was Eoghan O'Reilly of Corstown, County Meath. Edward's father moved to Harold's Cross, Dublin, where he practised as an apothecary. Edward was born on 6 December 1765...

 gives a full account of these in his 'Irish Writers', XC sq.; d. anno 984.

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...

 in his History of Ireland states- "Eochaidh Ua Floinn says in these verses: and he was the chief professor of poetry in Ireland in his time:—

Four sons, (who) were fierce of voice,

For noble children had Partholón:

They took under direction among them

The tribes of Ireland without objection "