Blessed Alan was one of the Dominican Fathers from the onastery at Dinan, in Brittany. He was an eminent theologian and was famous for his sermons. Our Lady chose him because, since the Confraternity (of the Holy Rosary) had originally been started in this province, it was most fitting that a Dominican from the very same province should have the honor of re-establishing it.
Blessed Alan began this great work in 1460 after a special warning from Our Lord. This is how he received His urgent message, as he tells it himself:
One day when he was saying Mass, Our Lord, Who wished to spur him on to preach the Holy Rosary, spoke to him in the Sacred Host: "How can you crucify Me again so soon?" Jesus said. "What did You say, Lord?" asked Blessed Alan horrified. "You crucified Me once before by your sins," answered Jesus, "and I would willingly be crucified again rather than have My Father offended by the sins you used to commit. You are crucifying Me again now because you have all the learning and understanding that you need to preach My Mother's Rosary, and you are not doing so. If you only did this you could teach many souls the right path and lead them away from sin - but you are not doing it and so you yourself are guilty of the sins that they commit.
This terrible reproach made Blessed Alan solemnly resolve to preach the Rosary unceasingly. Our Lady too spoke to him one day to inspire him to preach the Holy Rosary more and more:"You were a great sinner in your youth." she said, "but I obtained the grace of your conversion from my Son. Had such thing been possible I would have liked to have gone through all kinds of suffering to save you because converted sinners are a glory to me. And I would have done this also to make you worthy of preaching my Rosary far and wide."
Saint Dominic appeared to Blessed Alan as well and told him of the great results of his ministry: he had preached the Holy Rosary unceasingly, his sermons had borne great fruit and many people had been converted during his missions. He said to Blessed Alan:"See the wonderful results I have had through preaching the Holy Rosary ! You and all those who love Our Lady ought to do the same so that, by means of this holy practice of the Rosary, you may draw all people to the real science of the virtues.