Quo graviora was an apostolic constitution promulgated by Pope Leo XII on March 13, 1825, in which he decreed the prohibition of membership in Masonic Lodges in perpetuity.
References
Quo graviora (1825) Wikipedia(Text) CC BY-SA
Quo graviora was an apostolic constitution promulgated by Pope Leo XII on March 13, 1825, in which he decreed the prohibition of membership in Masonic Lodges in perpetuity.