From novinite.com: IXth Century Monastery Remains Unearthed in Bulgaria.
Posted on August 27, 2005 04:12 PM. Filed under: history & archaeology.Well-preserved monastery vault arches dated back to the IXth century were found during excavation works in the Karaach Tepe area near Varna.
The arches are the only ones that have remained from the monastery constructions of the Middle Ages, experts claim. The new findings prove that in the early stages of the Middle Ages the Bulgarians were able to compete with the Byzantines in that kind of construction works. [continue]