Wikipedia
Archeosofica is a school of esoteric Christianity founded by Tommaso Palamidessi in 1968 in Rome. It offers a program of research and of experimental results, by supplying Booklets and other textbooks in which the most important subjects of Archeosophy, i. e. “Science of Principles”, are developed.
The school requires neither a fee nor the subscription of any membership. The school of Archeosofica is free and offers a program of research and of experiments by supplying booklets and other texts. The foundation of Archeosofica is rooted in Palamidessi's spirit of collaboration on the spiritual realisation of man and woman. According to Tommaso Palamidessi, Archeosofica is
an esoteric school that prepares for Initiation: a free school for free scholars, who must not feel like pupils nor apprentices, but brothers who listen to the living voice of other brothers, or who wish to doctrinate themselves by their writings that present the results of serious studies and experiences: Brothers who have started out with a mentality free of prejudices and who have analyzed, chosen and accepted the best of all the other ancient and modern esoteric schools.
It is a call addressed to all, and it does not matter if they belong to the different communities ( Theosophists, Anthroposophists, Martinists, Rosicrucians, Catholics, Yoghists, etc.). The Brotherhood is only one, and it can have only one verb: Love one another; only one Master: Jesus the Christ.
Tommaso Palamidessi's thought about co-operation and fraternal spirit and is repeated more than once in his works and reveals the idea which inspired the foundation of Archeosofica
...we are all brothers and we must unite, love each other and work together. The Ecumenical Council is not only of the religions, but also of the esoteric societies. The times require the co-operation of all, and we offer a Way which is safe, swift, direct, towards the overcoming of one's own moral, psychic, spiritual and biological state.