Tre Fontane Abbey

Tre Fontane Abbey, or the Abbey of Saints Vincent and Anastasius, is a Roman Catholic abbey in Rome, held by monks of the Cistercian Order of the Strict Observance, better known as Trappists. It is known for raising the lambs whose wool is used to weave the pallia of new metropolitan archbishops. The pope blesses the lambs on the feast of Saint Agnes on January 21. The wool is prepared, and he gives the pallia to the new archbishops on the Solemnity of Saints Peter and Paul, the Holy Apostles.

Source: Wikipedia