By the end of the tenth century A.D., however, the First Bulgarian Kingdom was beginning to decline. Internally, the local population was weary from continual warring and from the oppression of feudalism. The boyars continued to struggle against the king and his council for their own autonomy. Because of the internal weakness of the country, Bulgaria's neighbors began to encroach on her borders. The Magyars (Hungarians) attacked from the northwest, seizing territory north of the Danube River. The Byzantines in 967 formed an alliance with the prince of Kiev in Russia and, because of this alliance, succeeded in invading Bulgaria repeatedly. In the late tenth century there was a brief revival of Bulgarian power under Samuel, when the Bulgarians succeeded in liberating the northeastern sector of the country from Byzantine control and captured southern Macedonia. But the revival was short lived. The Byzantine emperor, Basil II, was determined to regain his lost land and once again recaptured the northeastern sector. In 1014 Basil again invaded Bulgaria; defeated Samuel's army; and, in an act of matchless cruelty, blinded 14,000 Bulgarian soldiers. From 1018 until 1185 all of Bulgaria was under Byzantine rule. The eleventh and twelfth centuries witnessed a period of extreme hardship for the country. Byzantine domination was harsh and punitive. Monetary taxes, which added to the already heavy burdens of the peasantry, were levied in 1040. Bulgarian feudalism was replaced by Byzantine feudalism. The Byzantine church itself was a vehicle of oppression as it was later to become under Turkish rule; the church owned entire estates and villages and the people who inhabited them. There were a series of revolts during the eleventh century, but none were successful in overthrowing Byzantine tyranny. During this period the first and second crusades made their way through the Balkan Peninsula, wreaking havoc among the local populations. The Second Bulgarian Kingdom was established in 1186 and lasted until 1396, when--like the First Bulgarian Kingdom--it was conquered by a powerful enemy and neighbor. Ironically, history came full circle to spell defeat for the Bulgarians. In the twelfth century, when the Byzantine Empire was declining because of internal weakness, the Bulgarians were able to free themselves from domination. In the fourteenth 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.