That is some video you posted in there even if the link didn't pick it up directly. A bit strong in the use of selected imagery about the people of the Jewish Faith.
And CyrilVladisla, thanks for your video!
I love to check out information on the Eastern Roman empire and, since a time I can't remember, my favorite book on the subject is The Alexiad. Especially the versions that have a glossary of terms or foot notes to describe the titles used in the Empire for officials that are different than their Latin/Western Empire counterparts.
The Church of the Holy Apostles in Constantinople was used for centuries as an Imperial burial site and was used following the death of Emperor Constantine I until Constantine VIII.
Sadly the church was pillaged by the Ottomans post 1451 and the remains of all those buried there were dumped into the Bosphorus.
The dilapidated church was then demolished.
Some of the empty Imperial Tombs have survived and are housed outside the the Istanbul Archaeological Museum.