“The title "Mater Ter Admirabilis" (Mother thrice blessed) is first of all the name given to the miraculous image of Our Lady at Ingolstadt, Germany. Fr. James Rem, Jesuit, (1546-1618) saw in the advocation "Mater admirabilis" in the Litany of Loreto something like a summary of all of Mary's privileges and of her whole being. He reached this conviction during a mystical experience while the students of the Colloquium Marianum (Marian congregation) were singing the Litanies of Loreto. He had them repeat the advocation "Mater admirabilis" three times in the form of a "trisagion" (each time with greater emphasis). A custom developed, and the image of mother and child in the school chapel was named "thrice blessed or wonderful" (ter admirabilis). The meaning or explanation of the title given by Fr. Rem is not known. Subsequent commentators, like F. Hattler, saw in the threefold invocation a reference to Mary as Mother of God, Mother of the Redeemer and Mother of the Redeemed.” Marian Library