The Subiaco Cassinese Congregation is an international union of Benedictine houses within the Benedictine Confederation. It developed from the Subiaco Congregation, which was formed in 1867 through the initiative of Dom Pietro Casaretto, O.S.B., as a reform of the way of life of monasteries of the Cassinese Congregation, formed in 1408, toward a stricter contemplative observance, and received final approval in 1872 by Pope Pius IX. After discussions between the two congregations at the start of the 21st century, approval was given by Pope Benedict XVI in 2013 for the incorporation of the Cassinese Congregation into its offshoot, the Subiaco Congregation. The expanded congregation was given this new name.

Sant'Ambrogio della Massima is a Catholic church in rione Sant'Angelo, Rome, Italy, that perhaps dates to the 4th century. It was attached to a convent until it became the subject of a canonical investigation in the 19th century, when it was disbanded and repurposed as a missionary college and later an abbey church. It is said to have been associated with Saint Ambrose.