1) Bulgaria was founded in 681 AD and reached its greatest extent during the reigns of Kings Simeon and Ivan Asen II, spanning the Black, White, and Adriatic Seas.
2) Bulgarian culture flourished especially during the Christianization period beginning in 864 AD, when many churches and monasteries were built.
3) The capital of Preslav in the 10th century was a major literary and cultural center known for its painted ceramics without equal in Europe at the time.