Dec 3, 2015
On November 16, 1965, near the end of the Second Vatican Council, 42 bishops attending the Council met together in the catacombs of St. Domatilla in Rome, celebrated Mass, and signed a covenant committing themselves to lives of simplicity, frugality, and humility. The document is known as "The Pact of the Catacombs."
Drawn up anonymously, so as to avoid the appearance of grandstanding on the part of the signatories, the Pact was circulated to all the bishops at the Council, and received about 500 co-signatories (where were the other 1,700 bishops?). It was presented eventually to Pope Paul VI, who received it gratefully.
Here are the more notable "lifestyle" paragraphs of the document:
1. Regarding housing, food, and means of transportation and everything concerning these things, we will seek to live in accordance with the common average level of our people.