Alexandra's Well - St. Alphonsus Liguori relates a story about St. Dominic and the Rosary which strains credulity to the breaking point. Ultimately this story can be traced back to Bl. Alanus de Rupe. - http://people.bath.ac.uk/liskmj/living-spring/sourcearchive/ns5/ns5tgh2.htm
Bl. Alan de la Roche - The fourth chapter of St. Louis de Montfort's book "The Secret of the Rosary." - http://www.catholic.org/saints/saint.php?saint_id=482
Blessed Alanus de Rupe, OP - Also known as Alan or Alain. His cultus has never officially been approved, but he is customarily given the honorific "Blessed." - http://www.saintpatrickdc.org/ss/0908.htm#alai
Alanus de Rupe - Or Alanus de la Roche. Dominican, tireless promoter of the Rosary, d. 1475. - http://www.newadvent.org/cathen/01246a.htm