This country, once ruled by Samuel and Kaloyan, converted to Christianity under Boris I, and reached its greatest extent under Simeon the Great.
Omurtag solidified this country's northwestern border. One of its rulers lined the skull of Byzantine emperor Nicephorus I with silver and used it as a drinking cup. The first state of this name was established by Asparuh, while the second was founded by brothers Ivan and Peter Asen. One of its leaders led an uprising against Crusaders that captured Baldwin I at Adrianople. Another lost badly at Preslav. This country, once ruled by Samuel and Kaloyan, converted to Christianity under Boris I, and reached its greatest extent under Simeon the Great. Most of its army was decimated and blinded by Byzantine emperor Basil II, who became known as the "slayer" of its people. For 10 points, name this country on the Black Sea whose capitals have included Turnovo and Sofia.
Omurtag solidified this country's northwestern border. One of its rulers lined the skull of Byzantine emperor Nicephorus I with silver and used it as a drinking cup.
Bulgaria