Michel-Louis Guérard des Lauriers

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His Excellency

Michel-Louis Guérard des Lauriers
Michel-Louis Guérard des Lauriers.jpg
Ordination29 July 1931
Consecration7 May 1981
by Ngô Đình Thục
Personal details
Born25 October 1898
Died27 February 1988 (aged 89)
Cosne-sur-Loire, France
BuriedRaveau, France
ProfessionBishop and theologian
Ordination history of
Michel-Louis Guérard des Lauriers
Priestly ordination
Date29 July 1931
Episcopal consecration
Consecrated byNgô Đình Thục
Date7 May 1981
PlaceToulon, France
Episcopal succession
Bishops consecrated by Michel-Louis Guérard des Lauriers as principal consecrator
Günther Storck30 April 1984
Robert McKenna22 August 1986
Franco Munari25 November 1987
Styles of
Michel-Louis Guérard des Lauriers
Mitre plain 2.png
Reference style
Spoken styleYour Excellency
Religious styleYour Excellency

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


Michel-Louis Guérard des Lauriers was born near Paris, France,[2] on 25 October 1898.

In 1921, he entered the Scuola Normale Superiore. He studies for two years in Rome, with Professor Tullio Levi-Civita.[2]

In 1925, he entered the Order of Preachers.[2] He entered the Dominican novitiate of Amiens in 1927. He made his profession in 1930.[2]

He was a normalien and agrégé in mathematics.[3]


On 29 July 1931, des Lauriers was ordained a priest.

In 1933, he became a professor of philosophy at the Dominican school of theology, Le Saulchoir, in Belgium. 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.[4]

Under Pope Pius XII, he served as a professor at the Pontifical Lateran University in Rome.[5] Some time prior to 1950, he was an advisor to the same pope on the dogma of the Assumption of Mary (proclaimed in Munificentissimus Deus).[6]

With the advent of the Second Vatican Council in the 1960's, des Lauriers became concerned with events taking place in the Church. He was the main intellectual force behind the famous critical study of the Mass of Paul VI (Novus Ordo Mass) called the Ottaviani Intervention, presented to Paul VI in October 1969.[7]

In 1979, worried about Archbishop Marcel Lefebvre and a possible deal with the Vatican among other things, des Lauriers wrote to Lefebvre warning him.[8]


Des Lauriers then became a lecturer and professor at the International Seminary of Saint Pius X of Lefebvre's Society of Saint Pius X (SSPX) in Écône, Switzerland. He then presented his thesis that the Holy See might be vacant because Pope Paul VI was guilty of teaching heresy (see sedevacantism). Because of this view, he was removed from his seminary teaching post by Lefebvre in 1977.

Des Lauriers further developed his beliefs on the current state of the papacy, arguing that the necessary conclusion from Paul VI teaching heresy in the context of the Magisterium, was that he could not be a true pope, being only pope materially (papa materialiter) and not formally, known as the Thesis of Cassiciacum.


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 Paul VI were doubtfully valid (or even outright invalid) and therefore it was necessary to take action to secure a valid apostolic succession for the preservation of the (Latin Rite) Roman Catholic Church. He began discussions with Doctor Eberhard Heller and Doctor Kurt Hiller, German sedevacantists who were harboring Ngô Đình Thục (1897–1984), former archbishop of Huế, Vietnam, and after des Lauriers agreed to abate his sedeprivationism and adhere to the theoretical tenets of absolute/totalist sedevacantism, it was agreed that the archbishop would consecrate him a bishop.[1]

On 7 May 1981, after long consideration, des Lauriers was consecrated a bishop by Thuc in Toulon, France.

Des Lauriers consecrated three bishops: Günther Storck, a German, on 30 April 1984; Robert McKenna, an American, on 22 August 1986; and Franco Munari, an Italian, on 25 November 1987.

Death and legacy[edit]

Des Lauriers died in Cosne-sur-Loire, France, on 27 February 1988, at the age of 89. He is buried in Raveau, France.[2]

There are currently four bishops who adhere to his Thesis of Cassicicum: Bishop Geert Stuyver (a Belgian) of the Istituto Mater Boni Consilii (IMBC), which is based in Italy, and where des Lauriers is highly commemorated, Bishop Donald Sanborn and Bishop Joseph Selway (both Americans) of the Roman Catholic Institute (RCI), which is based in the United States, as well as Bishop Robert Neville of Michigan, United States.


By 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. ^ a b Edward Jarvis, Sede Vacante: the Life and Legacy of Archbishop Thục, Apocryphile Press, Berkeley CA, 2018, pp. 109-112 ISBN 1949643026
  2. ^ a b c d e Istituto Mater Boni Consilii (IMBC). "Memento di Padre Guérard des Lauriers o.p."
  3. ^ Notice IdRef de Sudoc
  4. ^ "Lauriers: Sur les systèmes différentiels du second ordre qui admettent un groupe continu fini de transformations" (PDF).
  5. ^ Boersma, Hans. Nouvelle Théologie and Sacramental Ontology, OUP Oxford, 2009, p. 27
  6. ^ 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.
  7. ^ Likoudis, James; Whitehead, Kenneth D. (2006). The Pope, the Council, and the Mass: Answers to Questions the "Traditionalists" Have Asked. Emmaus Road Publishing. p. 148. ISBN 9781931018340.
  8. ^ "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.

External links[edit]