century, when Bulgaria itself was weakened by domestic strife, it was conquered by an enemy whose oppression was greater than that of the Byzantine Empire: the Ottoman Turks.

At the close of the twelfth century the internal situation in Bulgaria was deteriorating. Taxes had been increased, and the burden borne by the peasants became still heavier. The feudal lords openly began to proclaim their independence from Byzantium, whose empire was by now steadily declining. Bulgaria was surrounded by its enemies: the Ottoman Turks, the Magyars, and the Normans. In 1183 the Magyars invaded, penetrating as far as Sofia. Realizing the vulnerability of the Byzantine Empire, the Bulgarians rebelled under the leadership of two brothers, Asen and Peter. The brothers first liberated northeastern Bulgaria and then proceeded into Thrace, where they were opposed by Isaac Angel, then emperor of Byzantium. In 1187 a peace treaty was concluded in which Byzantium conceded autonomy to Bulgaria.

Despite the peace treaty, however, the Bulgarians continued to wage war against the empire, hoping to regain northern Bulgaria and Macedonia—a contested territory and bitterly disputed issue throughout Bulgarian history. In 1201 the empire again concluded a peace treaty with the Bulgarians, ceding all of northern Bulgaria and a large part of Macedonia. Eventually, in 1207 Constantinople recognized the complete independence of Bulgaria, and Bulgarian freedom was firmly established.

This new-found independence, however, did not extend to the Bulgarian church, which was still under the aegis of the empire. For that reason Kaloyan, the Bulgarian ruler, negotiated with the Roman pope, Innocent III, in order to ally the Bulgarian church with the church of Rome. The motives of Rome and those of Kaloyan were similar: to isolate the influence of Byzantium from Bulgaria. In 1204 Kaloyan was crowned king by the papal nuncio in Turnovo. Although this union lasted only briefly, it served the purpose for which it was designed, and Bulgaria was effectively cut off from Byzantium.

During the thirteenth century the Holy Roman Empire replaced the Byzantine Empire on the borders of Bulgaria, and Byzantine aggression was replaced by that of the Holy Roman Empire. When Rome declared war on Bulgaria, the Bulgarians invaded Thrace, defeating the crusaders at Adrianople in 1205. The reestablishment of the Bulgarian patriarchate in 1235 represented the end of the short-lived alliance between the Bulgarian church and Rome.

Under the reign of Ivan Asen II in the mid-thirteenth century peace was again restored, and the country once more extended its territories. The Bulgarians succeeded in capturing eastern Thrace, the Aegean coast, Albania, and Macedonia. Bulgarian territory at this time was as great as under the reign of Tsar Simeon; with these conquests Bulgaria became the largest state in the Balkans. The country was now surrounded by three seas—the Black Sea, the Aegean Sea, and the Adriatic Sea—opening the country's doors to foreign trade and culture.

Again, as in the time of Simeon, the arts and cultural life of the country flourished. Monasteries, churches, and fortresses were constructed. Religious literature and art achieved a high level of excellence, and secular works became popular. The first chronicle of Bulgarian history was written, and an interest in history grew among the people. The first Bulgarian coins were minted at this time. Trade, particularly with Italy, increased greatly because of Bulgaria's free access to the sea. Merchants and ambassadors came to Bulgaria from abroad, lending their influence to Bulgaria's economic and cultural life.

By the second half of the thirteenth century, however, internal conditions in the country had deteriorated. The feudal system, which had been further consolidated during the thirteenth century, had exacerbated the tensions of the peasants, and hostilities among the boyars increased. The throne was contested between 1257 and 1277 and was eventually taken forcibly by Ivailo, known as the swineherd tsar because of his leadership of a peasant uprising in 1277.

Meanwhile, Bulgaria's neighbors again sensed an opportune time to attack because of the internal divisions in the country. The Byzantines conquered several parts of Macedonia and Thrace, and the Hungarians and Tatars invaded on another front. At one point the Hungarian king declared himself king of Bulgaria. In 1242 there was a large-scale Mongol invasion. Tatar raids went on continually between 1241 and 1300. The country was totally fragmented; each separate area attempted to ally itself with its former enemies, whether Russian, Hungarian, or Tatar, in order to prevent widespread damage.

By the fourteenth century the Turks began to envision the conquest of Bulgaria. Internally the boyars continued to fight among themselves, and externally the country was threatened alternately by Byzantium and by Serbia. By the mid-fourteenth century all of Macedonia was under Serbian control, and the Serbian tsar—much like the Hungarian king before him—called himself the tsar of the Bulgars. The area of the country retained by the Bulgars by this time was divided into three parts: the last Bulgarian tsar maintained his capital at Turnovo in the central highlands; the so-called Vidin Kingdom, ruled by the tsar's brother, existed in the far northwest; and a principality of Dobrudzha was established in the northeast.

At the same time the Ottoman Turks were beginning to advance. Having seized areas of Asia Minor, they proceeded to raid the Balkans from 1326 to 1352. Under their leader, Murad I, they began to attack Thrace, Macedonia, and parts of Bulgaria. By 1371 they were attacking territories in northeastern Thrace. At this point they marched against Sofia and, despite active resistance, succeeded in capturing it. Despite an alliance with the Serbs, the Bulgarians were too weak to resist further; in 1388 the Turks easily won a battle against the Serbs. The fall of Turnovo was followed by the fall of Vidin and Dobrudzha. By 1396 all of Bulgaria was under Turkish domination.

TURKISH RULE

The Second Bulgarian Kingdom, like the first, had ended in total defeat, and the darkest period in Bulgarian history began with the Turkish conquest. Only the priests of the Bulgarian Orthodox Church—despite its takeover by the Greeks—were able to preserve Bulgarian national literature and culture to some degree. The Bulgarians once again were subjected to foreign domination, only this time foreign rule lasted for five centuries. Historians agree that Turkish rule was a death blow to the creative forces that had been responsible for the development of the country to that time. With Turkish domination the normal economic, political, and social life of Bulgaria ground to a halt.

The Ottoman Turks were at a far lower stage of social development than either the Byzantine Empire, which preceded them in their occupation of the Balkans, or the Balkan states themselves. The Turks lived an almost nomadic life in primitive communal systems that were headed by tribal chiefs. When the Turks occupied Bulgaria, they replaced the established feudal system with their own more rudimentary and conservative feudalism. Many boyars were executed or rendered powerless if they failed to convert to Islam. The peasants were more completely under the feudal yoke than they had ever been under Byzantine rule. The Turks imposed heavy taxes and hard labor on the people of the conquered country, whom they considered cattle. Young boys were taken from their homes, proclaimed Muslims, and conscripted into the army.