Kal. vi. A.D. 432
From the death of the hero, Cucullainn, to this year, there are 431 years; from the death of Conchobhar Mac Nessa, 412 years.
Patrick, i.e. the Archbishop, comes to Hibernia, and begins to baptize the Scoti, in the ninth year of Theodosius the younger, the first year of the episcopate of Sixtus, 45th Bishop of the Roman Church, and the fourth year of the reign of Laeghaire, son of Niall.
— Chronicon Scotorum, Annal CS432.
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It is interesting to note when the Irish/Scottish annals date the stories and personages of the Ulster Cycle. It is as if the glorious mythological era in pagan Ireland came to an harmonious end with the Incarnation of Our Lord, His Lifetime, and the dawning of the New Religion.