They were divided into three main categories:[4] Pope Marcellus I (A.D. 306–308) is said to have recognized twenty five tituli in the City of Rome, quasi dioecesis.
[7] In Stephan Kuttner's view, "...the Roman cardinal priests and bishops were 'incardinated' for permanent (though limited) purposes into the patriarchal basilicas while remaining bound nonetheless to the churches of their original ordination.
In AD 499, a synod held by Pope Symmachus listed all the presbyters participating, as well as the tituli who were present at that time:[10] In the time of Pope Alexander II (1061-1073) those priests who served at St. Peter's Basilica were referred to as the seven cardinals of S. Peter's: septem cardinalibus S.
In the Great Jubilee in 2000, the seventh church was instead Santuario della Madonna del Divino Amore as appointed by Pope John Paul II.
This is a list of churches of Rome cited in Wikipedia articles or with related files on Wikimedia Commons.