This building is an Orthodox religion that is on the second ranking after St.Sophia. It is around 1000 years old. It is a complex with the baptistery.
It is an important Byzantian building. It was built on holy spring of Greeks. Bursa was an important center for East Roman Empire. So we can come across many Byzantian monuments here. For example, the hidden tunnels of Bursa are best samples of this period.