By 1185 the power of the Byzantine Empire again waned because of external conflicts. The noble brothers Asen and Peter led a revolt that forced Byzantine recognition of an autonomous Bulgarian state. Centered at Turnovo (present-day Veliko Turnovo), this state became the Second Bulgarian Empire. Like the First Bulgarian Empire, the second expanded at the expense of a preoccupied Byzantine Empire. In 1202 Tsar Kaloian (1197-1207) concluded a final peace with Byzantium that gave Bulgaria full independence. Kaloian also drove the Magyars from Bulgarian territory and in 1204 concluded a treaty with Rome that consolidated Bulgaria's western border by recognizing the authority of the pope. By the middle of the thirteenth century, Bulgaria again ruled from the Black Sea to the Adriatic. Access to the sea greatly increased commerce, especially with the Italian Peninsula. Turnovo became the center of Bulgarian culture, which enjoyed a second golden age.

The final phase of Bulgaria's second Balkan dominance was the reign of Kaloian's successor, Ivan Asen II. In this period, culture continued to flourish, but political instability again threatened. After the death of Ivan Asen II, internal and external political strife intensified. Sensing weakness, the Tatars began sixty years of raids in 1241, the Byzantines retook parts of the Second Bulgarian Empire, and the Magyars again advanced. From 1257 until 1277, aristocratic factions fought for control of the Bulgarian throne. Heavy taxation by feudal landlords caused their peasants to revolt in 1277 and enthrone the "swineherd tsar" Ivailo. After 1300 Tatar control ended, and a new period of expansion followed under Mikhail Shishman (1323-1330) and Ivan Aleksandur (1331-1370). As before, however, military and commercial success paralleled internal disorder; the social chaos of the previous century continued to erode the power of Bulgarian leaders. Meanwhile, Serbia had risen as a formidable rival in the Balkans, and the Ottoman Turks had advanced to the Aegean coast. In the late fourteenth century, Bulgaria was weakened by the division of its military defenses between the two perceived threats.

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Source: U.S. Library of Congress