While traditionally attributed to Saint Casimir of Poland because of his profound devotion, scholars now identify Saint Bernard of Cluny (12th century) as the likely author. Casimir popularized it, allegedly praying it daily on his knees.

The most popular English version was translated by Fr. Henry Bittleston around 1854.

The most common tune used today is known as "Laudes Mariae," though it is sometimes also called "Sunrise" or "Omni Die". Key Themes in the Lyrics

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