he would have disagreed he was very strict
First of all, I would like to mention that Byzantine was a long-lasting empire which rose out at the end of the Roman empire. It was great.
The major accomplishment of Byzantine architecture was The Hagia Sophia. It is located in Istanbul and it roughly took 6 years to complete it.
Good luck :)
It was the nation of "France" that the Germans initially won this territory from, although it should be noted that this was a highly contested "land-grab" and many French disagreed about the specific borders.