Fearadhach Finnfeachteach was invited to assume the reins of government.

"Good was Ireland during this his time.

The seasons were right tranquil; the earth brought forth its fruit; fishful its river-mouths; milkful the kine; heavy-headed the woods."[97] Another revolt of the Attacotti took place in the reign of Fiacha of the White Cattle.

He was killed by the provincial kings, at the slaughter of Magh Bolg.[98] Elim, one of the perpetrators of this outrage, obtained the crown, but his reign was singularly unprosperous; and Ireland was without corn, without milk, without fruit, without fish, and without any other great advantage, since the Aitheach Tuatha had killed Fiacha Finnolaidh in the slaughter of Magh Bolg, till the time of Tuathal Teachtmar.[99] Tuathal was the son of a former legitimate monarch, and had been invited to Ireland by a powerful party.

He was perpetually at war with the Attacotti, but at last established himself firmly on the throne, by exacting an oath from the people, "by the sun, moon, and elements," that his posterity should not be deprived of the sovereignty.