Emperors Basil II (left) Constantine VIII (right) in the Bari Exultet roll. Its role as actual portraits have been question by <a rel="nofollow" class="external text" href="https://www.jstor.org/stable/2856362">Ladner</a> (1942), but has been accepted by <a rel="nofollow" class="external text" href="https://books.google.com/books?id=AQ4VAAAAIAAJ&amp;pg=PA95">Spatharákīs</a> (1976) and, most notably, the <a rel="nofollow" class="external text" href="https://archive.org/details/odb_20210521/page/502">Oxford Dictionary of Byzantium</a>.
unknown 12th century artist
<a rel="nofollow" class="external text" href="https://thehistoryofbyzantium.com/2018/12/22/episode-179-where-were-we/">The History of Byzantium</a>