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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Again, I find it interesting that the Christian scribes of the various Irish and Scottish annals date the close of the legendary era of great heroes such as Cú Chulainn and the knights of the Red Branch with the birth of Our Lord and His age.