He was involved in the esoteric Masonic Martinist movement and claimed to have revived the Primitive Scottish Rite.

[1] The other two esotericists who signed the Charter to revive the Order were Robert Amadou (1924 – 2006) and Roger Ménard.

Ambelain, who always looked for possibilities to expand the Order, introduced elements that had nothing to do with the original Coëns: Neo-Gnosticism, Qabalah and Memphis-Misraim among others.

Ambelain entrusted its leadership to Ivan Mosca (1915 – 2005) – mystical name Hermete – who made the Order dormant in 1968 and then reawakened it in 1995.

Upon the death of Mosca, who did not designate successors, two groups claimed the legitimate succession, a Spanish and an Italian-French one.