The majority of St. Benedict's monks were not clerics, and all performed manual labour, the word conversi being used only to designate those who had received the habit late in life, to distinguish them from the oblati and nutriti.
So in Italy the lay brothers were instituted; and we find similar attempts at organization at the Abbey of St. Benignus at Dijon, under William of Dijon (d. 1031) and Richard of Verdun (d. 1046), while at Hirschau Abbey, Abbot William (d. 1091) gave a special rule to the fratres barbati and exteriores.”[1] “At Cluny Abbey the manual work was relegated mostly to paid servants, but the Carthusians, the Cistercians, the Order of Grandmont, and most subsequent religious orders possessed lay Brothers, to whom they committed their secular cares.
In England, the Benedictines made but slight use of lay brothers, finding the service of paid attendants more convenient.” Nonetheless, they are “mentioned in the customaries of the Abbey of St. Augustine at Canterbury and the Abbey of St. Peter at Westminster.”[1] In 1965, the Second Vatican Council issued the document Perfectae Caritatis, which called upon all religious institutes to re-examine and renew their charism.
As part of the subsequent reforms and experimentation, many of the distinctions between lay and choir religious in terms of dress and spiritual regimen were abolished or mitigated.
In some orders they were required to recite daily the Little Office of the Blessed Virgin Mary, but usually their labor in the fields (and hence away from the church) prevented them from participating in the Liturgy of the Hours.