Bust of roman emperor Domitianus —
Photo Credit: By I, Sailko, CC BY 2.5, https://commons.wikimedia.org/w/index.php?curid=5858660

A Solidus of Valens —
Photo Credit: By Photographed by: York Museums Trust Staff - This file has been provided by York Museums Trust as part of a GLAMwiki partnership., CC BY-SA 4.0, https://commons.wikimedia.org/w/index.php?curid=47679632

Gratian the Elder — from Promptuarii Iconum Insigniorum
Photo Credit: By Published by Guillaume Rouille (1518?-1589) - "Promptuarii Iconum Insigniorum", Public Domain, https://commons.wikimedia.org/w/index.php?curid=8854382

Solidus of emperor Valentinian I —
Photo Credit: By Siren-Com - Own work, CC BY-SA 3.0, https://commons.wikimedia.org/w/index.php?curid=10085849

Solidus of Gratian —
Photo Credit: By Photographed by: York Museums Trust Staff - This file has been provided by York Museums Trust as part of a GLAMwiki partnership., CC BY-SA 4.0, https://commons.wikimedia.org/w/index.php?curid=48145143

St. Ambrose — Early mosaic of Ambrose that may be an actual portrait.
Photo Credit: Public Domain, https://commons.wikimedia.org/w/index.php?curid=361248

Pope Pelagius II — In the Basilica of Saint Paul Outside the Walls
Photo Credit: Public Domain, https://commons.wikimedia.org/w/index.php?curid=3844952

Saint Sylvia —
Photo Credit: By unknown Italian painter - Public Domain, https://commons.wikimedia.org/w/index.php?curid=8331711

Pope Gregory I — In the Basilica of Saint Paul Outside the Walls, Rome
Photo Credit: By Unknown - Public Domain, https://commons.wikimedia.org/w/index.php?curid=42550544

The Four Great Doctors of the Western Church — Four doctors of the Church represented with attributes of the Four Evangelists: St. Augustine with an eagle, St. Gregory the Great with a bull, St. Hieronymus with an angel, St. Ambrosius with a winged lion.
Photo Credit: by Pier Francesco Sacchi, c. 1516

Bernard Saisset — Papal Legate - Project Gutenberg
Photo Credit: Public Domain, https://commons.wikimedia.org/w/index.php?curid=441401