The Rosary of the Virgin Mary, which gradually took form in the second millennium under the guidance of the Spirit of God, is a prayer loved by countless Saints and encouraged by numerous popes. No form of extra-liturgical devotion to Mary has been recommended more warmly or frequently by the Popes than the Rosary, which has been the favorite, moreover, of such saints as Teresa of Avila, Francis de Sales, Louis de Montfort, Alphonsus Liguori, Bernadette, Pio of Pietrelcina, and many more. The Mystical Rose Tree provides in a very accessible form what several modern Popes, from Leo XIII to Benedict XVI, have had to say about what they had learned about the Rosary, and how each of us Today, and the world as a whole, could profit from such learning and devotion.