Fr. Claude Bernard, known as the "Poor Priest", zealously dedicated himself to the preaching and aiding of prisoners and criminals condemned to death. Trusting his charges to the care and intercession of the Blessed Virgin Mary, Fr. Bernard employed the Memorare extensively in his work of evangelization to great effect. Many a criminal was reconciled to God through his efforts. At one time he had more than 200,000 leaflets printed with the Memorare in various languages so he could distribute the leaflets wherever he felt they would do some good.

Part of the reason Fr. Claude Bernard held the prayer in such high regard was because he himself felt that he had been miraculously cured by its use. In a letter to Queen Anne of Austria, wife of Louis XIII, he wrote that he was deathly ill once. In fear of his life he recited the Memorare and immediately began to get well again. Feeling unworthy of such a miracle, he attributed the cure to some unknown natural cause. Sometime later, Brother Fiacre, a discalced Augustinian, came to call upon Fr. Bernard. The good brother begged Fr. Bernard's pardon for disturbing him, but he desired to know how Fr. Bernard was getting along. Brother Fiacre then went on to say that the Virgin Mary had appeared to him in a vision, told him of Fr. Bernard's illness, told him how she had cured Fr. Bernard of it, and that he was to assure Fr. Bernard of this fact. Fr. Bernard then goes on to write in his letter that he was ashamed of his ingratitude in attributing the cure to natural causes, and asked for God's forgiveness in the matter.

Further evidence of association of the Memorare with Fr. Claude Bernard can be found in the Bibliotheque Nationale at Paris where 18 engraved portraits of this holy priest have the prayer engraved below the picture. The prayer there is basically identical in substance with the Memorare we have today and the heading simply says: ORAISON DU R. P. BERNARD A LA VERGE (Prayer of Rev. Fr. Bernard to the Virgin). In as much as some of these engravings are contemporary portraits of Fr. Bernard, his association with the prayer is very clear. It is easy to see how sometime after his death the Prayer of Fr. Claude Bernard became the Prayer of St. Bernard , and in most people's minds the Prayer of St. Bernard of Clairvaux.

While we have Fr. Claude Bernard to thank for promoting the Memorare, he is certainly not its original author. First, Fr. Bernard stated that he learned the prayer from his own father. Secondly, the prayer was known to and used by St. Francis de Sales who is 21 years older than Fr. Bernard. Thirdly, and most importantly, the prayer appears as part of the much longer 15th century prayer, Ad sanctitatis tuae pedes, dulcissima Virgo Maria .

Ad sanctitatis tuae pedes, dulcissima Virgo Maria is a rather long prayer that appears in a number of printed books and manuscripts from the last quarter of the 15th century and onwards. It appears in such works as the Hortulus Animae (15th cent.), the Antidotarius Animae (15th cent.) of Nicholas de Saliceto (Cistercian abbot of Bomgart, near Strasbourg), and the Precationum piarum Enchiridion, compiled around 1570 by Simon Verepaeus. The Memorare is an integral part of the text in each case. Exactly when the Memorare was extracted from this longer prayer has not yet been determined, but it likely occurred in the later part of the 16th century, around the time of Fr. Bernard and his father.

Since the later part of the 16th century several variants of the Memorare have appeared such as that found in the Coeleste Palmetum below. It is also found embedded in the Ave augustissima. The exact wording of the prayer stabilized during the 19th century to that given below and was first indulgenced by Pope Pius IX in 1846.

A partial indulgence is granted to the faithful who recite the Memorare.