Rule of St. Benedict
The Rule of St. Benedict is a set of rules for monks written by Saint Benedict. It requires giving away all of one's possessions and vowing obedience to the abbot. It was used as the basis of European monasticism.
Less well known is how Benedictine monks take a vow of stability, whereby they cannot move from their location: "If after twelve month' probation, he still persevere, he may be admitted to the vows of Stability, Conversion of Life, and Obedience, by which he binds himself for life to the monastery of his profession."
Also less well known is that the Rule of St. Benedict requires abstention from beef, but not from chicken. This abstention from beef likely contributes to the longevity in the lifespan of monks.