A canoness is a member of a religious community of women living a simple life. Many communities observe the monastic Rule of St. Augustine. The name corresponds to the male equivalent, a canon. The origin and Rule are common to both. As with the canons, there are two types: canonesses regular, who follow the Augustinian Rule, and secular canonesses, who follow no monastic Rule of Life.
The involvement of women in the work of the Church goes back to the earliest time, and their uniting together for community exercises was a natural development of religious worship. Many religious orders and congregations of men have related convents of nuns, following the same rules and constitutions, many communities of canonesses taking the name and rule of life laid down for the congregations of regular canons.
Saint Basil the Great in his rules addresses both men and women. Augustine of Hippo drew up the first general rule for such communities of women. It was written in the year 423 and was addressed to Felicitas, Superioress of the Monastery of Hippo, and to Rusticus, the priest whom Augustine had appointed to have charge of the nuns. In Ireland, St. Patrick instituted canons regular, and St. Bridget was the first of numberless canonesses. The monasteries of the Gilbertine Order were nearly always double, for men and women.
Towards the close of the 8th century, the title of canoness is found for the first time, and it was given to these communities of women who, while they professed a common life, yet did not carry out to its full extent the original Rule of St. Augustine. These canonesses were practically an imitation of the chapters of canons regular which had then recently been received through the introduction of the "Regula vitæ communis" of St. Chrodegang of Metz. The canonesses took but two vows, chastity and obedience. Their superiors were known as abbesses, often held princely rank and had feudal jurisdiction.
The occupations of the canonesses consisted in the recitation of the Divine Office, the care of the church vestments, and the education of the young, particularly the daughters of the nobility. The regular canonesses, for the most part, follow the Rule of St. Augustine, but local circumstances have been the means of introducing various changes in details.