Are you saying that circular churches were being built in your country during those centuries?
That fact appears in any text published anywhere concerning church architecture, religious school books... I have no idea how is it popular and do not care. No one objects or says it's not true. It's enough for me.
Actually it doesn't. I've given you evidence before, even from Orthodox architects. Look at books onChristian architecture and my point will be proven.
How do you know what happens here? Can you read Polish? Have you ever been to Poland?
I'm talking about Europe in general, and for the majority of Christendom. Poland, like Russia, didn't arrive on the scene of Christianity until the middle of the 10th Century, and unfortunately on the side of the Pope.
From what I've seen so far, the earliest Church still extant in Poland is in Krakow, and it is a square church. Yet that doesn't mean that square or circular churches are the norm. In fact, they are definitely not the norm. As I've said before, square and circular churches were always martyria, baptisteries and the like. However, like today there were people who didn't know what they were doing and built churches in that manner. It didn't seem to be that hard for the Latins to serve in such churches, but such buildings aren't suitable for the Divine Liturgy.
The St. George Rotunda is one of the few examples in the East of a circular church. It wasn't built as a church though, it was built as a mausoleum for the Roman governor. The Christians took it and turned it into a church like many other places. However, the Rotunda needed a 50ft apse added to it to to at least make it somewhat directional and so it could face east appropriately.
There is also a difference between square buildings and octagonal/circular buildings. In fact, most Orthodox Churches (or many) are square, but are still in the shape of the cross inside, giving it a clear direction/orientation towards the holy of holies.
I've even spoken to someone who was once a member at the parish in Milwaukee at the Greek Church that Frank Lloyd Wright designed (the one that looks like an ugly UFO). This person supported everything I've said about circular churches, it is not condusive to the liturgy.
Also, I thought you were Ukrainian living in Poland? Isn't Poland 90% Catholic? I think Ukraine has wonderful examples of Orthodox architecture.
Roman Catholic (and Protestant/Anglican) architecture post-schism shouldn't be used for Orthodox architecture. If we want to know good precedents for Orthodox Churches, we need to look at other Orthodox architecture, not at Roman Catholic architecture.