The next event of consequence after the birth of Christ is the celebrated revolt led by Cairbré Cinn-cait, of the Athach-Tuatha,[10] or unfree clans of Ireland, in other words the serfs or plebeians, against the free clans or nobility, whom they all but exterminated, three unborn children of noble line alone escaping.[11] The people of Ireland were plagued--as though by heaven--with bad seasons and lack of fruit during the usurper Cairbré's reign. As the "Four Masters" graphically put it, "evil was the state of Ireland during his reign, fruitless her corn, for there used to be but one grain on the stalk; fishless her rivers; milkless her cattle; unplenty her fruit, for there used to be but one acorn on the oak." The belief that bad seasons were sent as a punishment of bad rulers was a very ancient and universal one in Ireland, and continued until very lately. The ode which the ollav or head-bard is said to have chanted in the ears of each newly-inaugurated prince, took care to recall it to his mind, and may be thus translated:-- "Seven witnesses there be Of the broken faith of kings. First--to trample on the free, Next--to sully sacred things, Next--to strain the law divine, (This defeat in battle brings). Famine, slaughter, milkless kine, And disease on flying wings. These the seven-fold vivid lights That light the perjury of kings!"[12] According to the Book of Conquests the people of Ireland, plagued by famine and bad seasons, brought in, on the death of Cairbré, the old reigning families again, making Fearadach king, and the "Athach-Tuatha swore by the heaven and earth, sun, moon, and all the elements, that they would be obedient to them and their descendants, as long as the sea should surround Ireland." The land recovered its tranquillity with the reign of Fearadach. "Good was Ireland during his time. The seasons were right tranquil; the earth brought forth its fruit. Fishful its river mouths; milkful the kine; heavy-headed the woods."