This is my speculative 1:1 scale reconstruction of the Palace of Myrelaion/Amastranium as it would of appeared in 5th century Constantinople.
Not much is known about this building besides it was the second largest rotunda ever made during the roman period only second to the pantheon in rome.Its unknown how it was destroyed and its foundations ended up being used to support a church in the early middle ages This building was only discovered in the 1960s by Archaeological excavations in the area and i based the buildings polychrome (coloring) and mosaics on what was found.
This is also mostly styled after the Antoine Helbert reconstruction of it with the exception of the interior was changed to use the alternative pantheon interior model from the new york met museum of art.

heres the link to the antoine helbert source www.antoine-helbert.com/fr/portfolio/annexe-work/byzance-architecture.html

Please enjoy and hope it inspires some more roman builds, you can use it for anything you want just give me credit for building it