First Council of Constantinople — Manuscript BnF Grec 510 (Homilies of St. Gregory of Nazianzus), folio 355 recto. Miniature of the First Council of Constantinople (AD 381). The emperor Theodosius I and a crowd of bishops seated on a semicircular bench, on either side of an enthroned Gospel Book. An heretic, Macedonius, occupies the lower left corner of the miniature.
Photo Credit: Public Domain, https://commons.wikimedia.org/w/index.php?curid=38630217