During a siege of Thessaloniki the third brother also fell victim to another boyar plot: in the autumn of 1207 he was killed in his tent. One of the plotters – and nephew to Kaloyan – King Boril (1207-1218) ascended to the throne. A political crisis broke up. As the usurper Boril initiated a persecution of all Kaloyan’s relatives his two nephews, sons of the old king Assen, Ivan Assen and Alexander, lied to Russia. For some time, however, the conflicts along the borders of the country were suspended due to the treaties with the Lati n Empire and the Hungarian Kingdom but the resentment within sharpened Tours Bulgaria.
A factor that additionally jeopardized the crown became the movement of the Bogomils. So in 1211 Boril held the Council of Tumovo which condemned the new heresy. Uprisings broke up. Taking advantage of the confusion and assisted by a Russian military unit Ivan Assen II laid a continuous siege to the capital Tumovo, dethroned Boril and blinded him. Thus the successor of the Dynasty of the Assenids. King Ivan II Assen (1218-1241) came to the throne.
Ivan II Assen inaugurated a period of prosperity during which Bulgaria regained the frontiers it had achieved under Tsar Simeon the Great.
Diplomacy consolidated
An economic and cultural upsurge marked his rule. The new king’s diplomacy consolidated the state and strengthened the relations with the Latin Empire and Hungary. A peace treaty was signed with the ruler of the Epirus region Theodore Comnenus.
Ivan II Assen even engaged his daughter Elena to the Byzantine Emperor Baldwin II, still under age by the time.
But Theodore Comnenus violated the peace treaty and led a large army north- The Church of the Virgin of Petrich in Ivan II Assens Fortress.
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