In the beginning, the "society" (Gesellschaft) had few rules, among them regulations (Bier-Comment [de]) on how to properly consume vast amounts of beer during social gatherings.

Under this pressure, it was decided to amend the society's constitution so as to make it compulsory for members of Leonensia to give satisfaction where an offence had violated the honor of the challenging party.

With this decision, Leonensia was able to adhere to the code of honor of fraternities in Heidelberg while protecting itself from frivolous mass challenges by Vandalia.

Historian Martin Dröge confirms this assessment in a biography on Nazi politician Karl-Friedrich Kolbow [de]: "If you wanted to start a career as a jurist in Mecklenburg, establishing contacts as an active member of Leonensia was essential."

)[5] The influence of Leonensia in Mecklenburg is borne out by the fact that its member, Adolf Langfeld [de], served as first minister of the Grand Duchy of Mecklenburg-Schwerin until the outbreak of the German Revolution of 1918–19.

Legal historian Björn Bertram writes about Leonensia's Hermann Krause [de] that the fraternity could host tablerounds only twice a month.

In 1921, Carl Gernandt, then executive officer (Vorstandsmitglied) of Leonensia's association of senior members (Altherrenverein [de]), condemned the international impotence of the Weimar Republic and called for revenge on France.

Clashes with the Sturmabteilung in Göttingen [de] and Heidelberg [] demonstrate the potential for conflict between National Socialism and some student fraternities.

As league members, students had also to join suborganisations of the NSDAP (Sturmabteilung, Schutzstaffel, National Socialist Motor Corps, Hitler Youth etc.).

On 14 May 1936, Hitler's deputy Rudolf Heß issued a decree outlawing simultaneous membership in a suborganization of the NSDAP and in a student fraternity.

The Kameradschaft Achim von Armin, being itself a suborganisation of the National Socialist German Student's League, was subsequently disbanded.

[13] In July 1958, the convention of the senior member's association decided to abandon the principle of compulsory satisfaction which Leonensia had adopted 80 years earlier.

This custom was abandoned by the younger generation when a memorial plaque, paying tribut to Leonensia's casualties of World War II, was to be inaugurated at the fraternity house.