Conor resolved at last to move Atharna to go to the King of Leinster, in the hope that he himself might be rid of Atharna, by the King of Leinster killing him for his insolence and his exactions, and that he might avenge the death of his bard by the invasion of Leinster.
Atharna therefore set out for Leinster accompanied by his train of poets and harpers and gillies and arrived at the great Dun of Mesgedra the King, at Naas in Kildare.

Here he dwelt for twelve months wasting the substance of the Leinstermen and in the end when he was minded to return to Ulster he went before the King Mesgedra and the lords of Leinster and demanded his poet's fee.
"What is thy demand, Atharna ?" asked Mesgedra.
"So many cattle and so many sheep," answered Atharna, "and store of gold and raiment, and of the fairest dames and maidens of Leinster forty-five, to grind at my querns in Dun Atharna." "It shall be granted thee," said the King.

Then Atharna feared some mischief, for the King and the nobles of Leinster had not seemed like men on whom shameful conditions are laid, nor had they offered to ransom their women.

Atharna therefore judged that the Leinstermen might fall upon him to recover their booty when he was once beyond the border, for within their own borders they might not affront a guest.
He sent, therefore, a swift messenger to Conor mac Nessa, bidding him come with a strong escort as quickly as he might, to meet Atharna's band on the marches of Leinster, and convey him safely home.
Atharna then departed from Naas with a great herd of sheep and cattle and other spoils, and with thrice fifteen of the noble women of Leinster.

He went leisurely, meaning to strike the highroad to Emania from Dublin; but when he came thither the Liffey was swollen with rain, and the ford at Dublin might not be crossed.