‘This much you may tell me,” said the king: “when he will be born and in what place.”

Merlin began to smile and said, “By this you think to find him. But you won’t, for it does not please Our Lord.”

“Indeed, I will,” said the king. “If I know the hour of his birth and the country where he will be born, this land will never be destroyed by him, for I’ll forestall him.”

“I’ll tell it to you,” said Merlin, “and you will still fail completely. Know that he will be born the first day of May in the kingdom of Logres.”

Post-Vulgate Merlin