Meanwhile western Bulgaria had not been touched, and it was thither that the Bulgarian patriarch Damian removed from Silistria after the victory of the Greeks, settling first in Sofia and then in Okhrida in Macedonia, where the apostate Shishman had eventually made his capital. Western Bulgaria included Macedonia and parts of Thessaly, Albania, southern and eastern Serbia, and the westernmost parts of modern Bulgaria. It was from this district that numerous anti-Hellenic revolts were directed after the death of the Emperor John Tzimisces in 976. These culminated during the reign of Samuel (977-1014), one of the sons of Shishman. He was as capable and energetic, as unscrupulous and inhuman, as the situation he was called upon to fill demanded. He began by assassinating all his relations and nobles who resented his desire to re-establish the absolute monarchy, was recognized as tsar by the Holy See of Rome in 981, and then began to fight the Greeks, the only possible occupation for any self-respecting Bulgarian ruler. The emperor at that time was Basil II (976-1025), who was brave and patriotic but young and inexperienced. In his early campaigns Samuel carried all before him; he reconquered northern Bulgaria in 985, Thessaly in 986, and defeated Basil II near Sofia the same year. Later he conquered Albania and the southern parts of Serbia and what is now Montenegro and Hercegovina. In 996 he threatened Salonika, but first of all embarked on an expedition against the Peloponnese; here he was followed by the Greek general, who managed to surprise and completely overwhelm him, he and his son barely escaping with their lives.
From that year (996) his fortune changed; the Greeks reoccupied northern Bulgaria, in 999, and also recovered Thessaly and parts of Macedonia. The Bulgars were subjected to almost annual attacks on the part of Basil II; the country was ruined and could not long hold out. The final disaster occurred in 1014, when Basil II utterly defeated his inveterate foe in a pass near Seres in Macedonia. Samuel escaped to Prilip, but when he beheld the return of 15,000 of his troops who had been captured and blinded by the Greeks he died of syncope. Basil II, known as Bulgaroctonus, or Bulgar-killer, went from victory to victory, and finally occupied the Bulgarian capital of Okhrida in 1016. Western Bulgaria came to an end, as had eastern Bulgaria in 972, the remaining members of the royal family followed the emperor to the Bosphorus to enjoy comfortable captivity, and the triumph of Constantinople was complete.
From 1018 to 1186 Bulgaria had no existence as an independent state; Basil II, although cruel, was far from tyrannical in his general treatment of the Bulgars, and treated the conquered territory more as a protectorate than as a possession. But after his death Greek rule became much more oppressive. The Bulgarian patriarchate (since 972 established at Okhrida) was reduced to an archbishopric, and in 1025 the see was given to a Greek, who lost no time in eliminating the Bulgarian element from positions of importance throughout his diocese. Many of the nobles were transplanted to Constantinople, where their opposition was numbed by the bestowal of honours. During the eleventh century the peninsula was invaded frequently by the Tartar Pechenegs and Kumans, whose aid was invoked both by Greeks and Bulgars; the result of these incursions was not always favourable to those who had promoted them; the barbarians invariably stayed longer and did more damage than had been bargained for, and usually left some of their number behind as unwelcome settlers.
In this way the ethnological map of the Balkan peninsula became ever more variegated. To the Tartar settlers were added colonies of Armenians and Vlakhs by various emperors. The last touch was given by the arrival of the Normans in 1081 and the passage of the crusaders in 1096. The wholesale depredations of the latter naturally made the inhabitants of the Balkan peninsula anything but sympathetically disposed towards their cause. One of the results of all this turmoil and of the heavy hand of the Greeks was a great increase in the vitality of the Bogomil heresy already referred to; it became a refuge for patriotism and an outlet for its expression. The Emperor Alexis Comnenus instituted a bitter persecution of it, which only led to its growth and rapid propagation westwards into Serbia from its centre Philippopolis.
The reason of the complete overthrow of the Bulgarian monarchy by the Greeks was of course that the nation itself was totally lacking in cohesion and organization, and could only achieve any lasting success when an exceptionally gifted ruler managed to discount the centrifugal tendencies of the feudal nobles, as Simeon and Samuel had done. Other discouraging factors wore the permeation of the Church and State by Byzantine influence, the lack of a large standing army, the spread of the anarchic Bogomil heresy, and the fact that the bulk of the Slav population had no desire for foreign adventure or national aggrandizement.