Michel-Louis Guérard des Lauriers

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His Most Reverend Excellency

Michel-Louis Guérard des Lauriers

Ordination29 July 1931
Consecration7 May 1981
by Ngô Đình Thục
Personal details
Born25 October 1898
Died27 February 1988
Cosne-sur-Loire, France
DenominationSedevacantist/ Sedeprivationist
Ordination history of
Michel-Louis Guérard des Lauriers
Priestly ordination
Date29 July 1931
Episcopal consecration
Consecrated byMost Rev. Ngô Đình Thục
Date7 May 1981
PlaceToulon, France
Episcopal succession
Bishops consecrated by Michel-Louis Guérard des Lauriers as principal consecrator
Gunther Storck30 April 1984
Robert McKenna22 August 1986
Franco Munari25 November 1987

Michel-Louis Guérard des Lauriers OP (25 October 1898 – 27 February 1988) was a Dominican theologian and, in later life, a traditionalist bishop who supported sedevacantism and sedeprivationism and was excommunicated.[1]


Guérard des Lauriers at his episcopal consecration

A normalien and agrégé in mathematics,[2] Michel-Louis Guérard des Lauriers entered the Dominican novitiate of Amiens in 1927 and was ordained a priest on 29 July 1931. He was an Invited Speaker of the ICM in 1932 in Zurich.[citation needed]

He became a professor of philosophy at the Dominican school of theology, Le Saulchoir, in Belgium in 1933. In 1940, he received a doctorate in mathematics with thesis Sur les systèmes différentiels du second ordre qui admettent un groupe continu fini de transformations.[3] Under Pope Pius XII (1939–1958), Fr. Guérard des Lauriers served as a professor at the Pontifical Lateran University in Rome.[4] Some time prior to 1950, Guérard des Lauriers, O.P., was an advisor to the Pope on the dogma of the Assumption of Mary (proclaimed in Munificentissimus Deus).[5] From 1954 until 1955 he served as personal Father Confessor to Pius XII, before being replaced by Fr. Augustin Bea, S.J.

With the advent of the Second Vatican Council in the 1960s, Guérard des Lauriers became concerned with events taking place in the Church. In 1969 he co-authored the Ottaviani Intervention which was a critical study of the new Mass. In 1970 Pope Paul VI made public a document demanding the resignation of certain conservative professors at the pontifical universities of Rome, among them Guérard des Lauriers.

In 1979, worried about Archbishop Lefebvre and a possible deal with Rome among other things, Fr. Lauriers wrote to Lefebvre warning him.[6][7]


Guérard des Lauriers then became a lecturer and professor at Archbishop Marcel Lefebvre's St. Pius X seminary in Écône, Switzerland. He then presented his thesis that the Chair of Peter might be vacant because Pope Paul VI was guilty of heresy (see sedevacantism and sedeprivationism). Because of this view, Lefebvre removed Guérard des Lauriers from his seminary teaching post in 1977.

He further developed his beliefs on the current state of the papacy, relying on Cardinal Cajetan and St. Robert Bellarmine, arguing that Pope Paul VI, as a result of his heresy, was not a true pope, being only pope materially (papa materialiter) and not formally, known as the "Cassiciacum thesis".[citation needed]

Guérard des Lauriers further believed that the new rites of ordination and episcopal consecration (newest Pontificale Romanum, new forms by promulgation of 18 June 1968) promulgated by Pope Paul VI were doubtfully valid (or even outrightly invalid) and therefore it was necessary to take action to secure a valid succession of bishops for the preservation of the (Latin Rite) Roman Catholic Church. He began discussions with Dr. Eberhard Heller and Dr. Hiller, German sedevacantist activists who were harboring Most. Rev. Pierre Martin Ngô Đình Thục (1897–1984), the former archbishop of Huế, Vietnam, and after des Lauriers agreed to abate his Sedeprivationism and adhere to the theoretical tenets of Sedevacantism, it was agreed that the Archbishop Emeritus would consecrate him as a bishop.[8]

After long consideration, on 7 May 1981, des Lauriers was consecrated bishop by Ngo Dinh Thuc in Toulon, France. Shortly after, des Lauriers reiterated his Sedeprivationism and commenced a polemical war with the Sedevacantists, including Ngô Đình Thuc and Drs. Heller and Hiller.

Guérard des Lauriers died in Cosne-sur-Loire, France, in 1988 at the age of 90.


By Guérard des Lauriers[edit]

  • Le Saint-Esprit, âme de l'Eglise, Étiolles, Seine et Oise : Monastère de la Croix, 1948.
  • Garabandal, S.l., 1965.
  • Lettera ad un religioso di Simone Weil ; trad. di Mariella Bettarini. Risposta alla Lettera ad un religioso di Guérard des Lauriers ; trad. di Carmen Montesano (Lettre à un religieux), Torino : Borla, 1970.
  • La Mathématique, les mathématiques, la mathématique moderne, Paris : Doin, 1972.
  • Homélie (prononcée le 15 mai 1971 pour l'anniversaire de la mort de l'amiral de Penfentenyo de Kervéréguin), Versailles : R.O.C., 1973.
  • La Charité de la vérité, Villegenon : Sainte Jeanne d'Arc, 1985.
  • La Présence réelle du Verbe incarné dans les espèces consacrées, Villegenon : Sainte Jeanne d'Arc, 1987.

On des Lauriers' doctrine[edit]


  1. ^ Edward Jarvis, Sede Vacante: the Life and Legacy of Archbishop Thục, Apocryphile Press, Berkeley CA, 2018, pp. 109-112 ISBN 1949643026
  2. ^ Notice IdRef de Sudoc
  3. ^ "Lauriers: Sur les systèmes différentiels du second ordre qui admettent un groupe continu fini de transformations" (PDF).
  4. ^ Boersma, Hans. Nouvelle Théologie and Sacramental Ontology, OUP Oxford, 2009, p. 27
  5. ^ Marshall, Taylor R. (2019-05-22). Infiltration: The Plot to Destroy the Church from Within (in German). Sophia Institute Press. ISBN 978-1-62282-847-0.
  6. ^ "Fr. Guérard des Lauriers to Msgr. Lefèbvre: You Act like Pontius Pilate'". www.traditioninaction.org. 1979. Retrieved 2019-10-06.
  7. ^ "Sodalitium - Site officiel de l'Institut Mater Boni Consilii" (PDF). Sodalitium (in French). Archived (PDF) from the original on 2016-04-11. Retrieved 2019-10-06.
  8. ^ Edward Jarvis, Sede Vacante: the Life and Legacy of Archbishop Thục, Apocryphile Press, Berkeley CA, 2018, pp. 109-112 ISBN 1949643026

External links[edit]