About Mary Theodosia Mug
Lived 1860 – 1943 (aged 82–83). Mary Theodosia Mug was an American nun, writer, biographer and historian.
Mary Theodosia Mug (1860–1943) was an author, poet, composer, and the biographer of Saint Mother Théodore Guérin. After almost 90 years of controversy, Sister Mug's miraculous healing from cancer was finally accepted in 2006 by the Holy See as Guérin's first miracle for sainthood. Sister Mug published books and also composed music under the pseudonym H. Maery or Helen Maery, although she did occasionally use her religious name.
Early life and education She was born Helen Mary Mug in Attica, Indiana to Ellen Phillips Mug and John Mug. Her mother was a student at St. Mary-of-the-Woods College in the 1850s, and she knew Mother Guérin, who had personally prepared her for her first communion. Ellen was still a student when Mother Guérin died in 1856. For primary and high school daughter Helen Mary Mug was educated at St. Ignatius Academy in Lafayette (today St. Ignatius School), and then she enrolled at St. Mary-of-the-Woods College, where she graduated in 1877. She entered the Sisters of Providence of Saint Mary-of-the-Woods congregation the following January, professing her perpetual vows on August 15, 1891, and taking her religious name of Sister Mary Theodosia Helen Mug.
Before her prayers at Mother Guérin's tomb, Sister Mug's condition had deteriorated considerably, with fainting and vomiting. She had suffered nerve damage following a mastectomy for breast cancer at the hospital in Terre Haute, and she had pain in both arms and her right hand, which were difficult to use. The cancer had also spread to her abdomen, and Dr. Willien, her physician, did not want to disturb it for fear she would die.
Mother Guérin's cause for canonization was opened in Rome the following year, in 1909, and it was formally submitted to the Congregation of Rites in 1914. A postulator from that process had dismissed Sister Mug's healing, saying it wasn't a miracle. Father Andrea Ambrosi became Mother Guérin's postulator in 2006 when she was canonized. Ambrosi decided the earlier dismissal was wrong, and accepted the miracle.
Writing and selected works Sister Mary Theodosia befriended older Sisters of Providence who remembered Mother Guérin well, and who would also have known her own mother when she was a student. According to Penny Blaker Mitchell, whose work was published by the sisters, she learned from Sister Basilide, Sister Mary Joseph, Olympiade, Sister Mary Xavier, and Mother Mary Cecilia. This knowledge made her a natural choice to do the writing when Silas Chatard, Bishop of Indianapolis, asked the congregation for a book about Mother Guérin.
1904. The Life and Life-Work of Mother Théodore Guérin, Foundress of the Sisters of Providence at St.-Mary-of-the-Woods, a biography of Mother Guérin. Written anonymously as "A Member of the Congregation." 1912. Eucharistic Lilies: Youthful Lovers of Jesus in the Blessed Sacrament Written pseudonymously as Helen Maery. 1918. Hymn to Our Lady, Patroness of the United States, piano/vocal sheet music, written as H. Meary, words by Rev. William P. Treacy. 1925. Thoughts for You and Me, poetry by Sister Mary Viola Burke, Sister Mary Teresita Frawley, Sister Loretta Therese Bierman, Sister Mary Borromeo Brown, Sister Francis Cecile Miller, and Sister Mary Theodosia Mug. 1925. Hymn to the Little Flower: St. Teresa of the Child Jesus, piano/vocal sheet music published by The Little Flower Publishing Company, St. Mary-of-the-Woods, Indiana, as H. Meary. 1931. Lest We Forget: The Sisters of Providence of Saint Mary-of-the-Woods in Civil War Service, booklet about how the City Hospital of Indianapolis became a Military Hospital during the Civil War. 1942. Journals and Letters of Mother Theodore Guérin, Foundress of the Sisters of Providence of Saint Mary-of-the Woods, as Sister Mary Theodosia Mug, editor.
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Important facts
People in Mary Theodosia Mug's life
Named in this biography and alive at the same time
Contemporaries
People whose lives overlapped Mary Theodosia Mug's
Frequently asked questions
Who was Mary Theodosia Mug?
nun, penwoman, biographer, historian (1860-1943)
When was Mary Theodosia Mug born?
Mary Theodosia Mug was born in 1860 in Attica.
When did Mary Theodosia Mug die?
Mary Theodosia Mug died in 1943.
What was Mary Theodosia Mug's occupation?
Mary Theodosia Mug was a nun, writer, biographer and historian.
What nationality was Mary Theodosia Mug?
Mary Theodosia Mug was American.
Sources & further reading
· Wikipedia: Mary Theodosia Mug
Cite this page
APA: Biography.guide. (2026). Mary Theodosia Mug. https://biography.guide/mary-theodosia-mug/
MLA: "Mary Theodosia Mug." Biography.guide, https://biography.guide/mary-theodosia-mug/.
Chicago: "Mary Theodosia Mug." Biography.guide. https://biography.guide/mary-theodosia-mug/.
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