Comment on The Basilica of Bari by BricksandStones

It's a shame that you didn't had the opportunity to study it, but then again, nothing much was going on there, so it make sense to not give it much attention (paradoxically, it's the most well documented region of the entire empire, more than Asia minor even, because most of the administrative sources have survived).

Something fun to do is to see how much the toponymy there betrays the byzantine legacy (the name of the Basilicate region, the swap between ancient and new Calabria...) and, as you say, the survival of greek dialects there.

Thank you very much for listing those churches (and the link!)!

As for Sicily, from the top of my head, I can think only of the cuba santa domenica.

There's also the Santissima Trinità di Delia which, although dating from the Norman period, is very representative of what byzantine churches might have looked like in earlier centuries. And, naturally, there is the famous palatine chapel of Palermo which isn't technically byzantine but in the same way as San Marco, so it kinda count still I think  

Also, the surviving byzantine churches of Sardinia might have been pretty close to the ones found in Sicily (though maybe bigger, again, Sicily was one of the most wealthy region of the empire), like the San Saturnino basilica and Nostra Segnora de Mesumundu.