Consolidation (
Dubrovnik) The first decade of Ivan Asen's rule is poorly documented. Andrew II of Hungary reached Bulgaria during his return from the Fifth Crusade in late 1218. Ivan Asen did not allow the king to cross the country until Andrew promised to give his daughter,
Maria, in marriage to him. Maria's dowry included the region of Belgrade and
Braničevo, the possession of which had been disputed by the Hungarian and Bulgarian rulers for decades. When
Robert of Courtenay, the newly elected
Latin Emperor, was marching from France towards Constantinople in 1221, Ivan Asen accompanied him across Bulgaria. He also supplied the emperor's retinue with food and fodder. The relationship between Bulgaria and the Latin Empire remained peaceful during the reign of Robert. Ivan Asen also made peace with the
ruler of Epirus,
Theodore Komnenos Doukas, who was one of the principal enemies of the Latin Empire. Theodore's brother,
Manuel Doukas, married Ivan Asen's illegitimate daughter, Mary, in 1225. Theodore who regarded himself the lawful successor of the Byzantine emperors was crowned
emperor around 1226. The Latin Emperor Robert was succeeded by his 11-year-old brother,
Baldwin II, in January 1228. Ivan Asen proposed to marry off his daughter,
Helen, to the young emperor, because he wanted to lay claim to the regency. He also promised to unite his troops with the Latins to reconquer the territories that they had lost to Theodore Komnenos Doukas. Although the Latin lords did not want to accept his offer, they started negotiations about it, because they tried to avoid a military conflict with him. Simultaneously, they offered the regency to the former
king of Jerusalem,
John of Brienne, who agreed to leave Italy for Constantinople, but they kept their agreement in secret for years. Only Venetian authors who compiled their chronicles decades after the events
Marino Sanudo,
Andrea Dandolo and
Lorenzo de Monacisrecorded Ivan Asen's offer to the Latins, but the reliability of their report is widely accepted by modern historians. Relationship between Bulgaria and Hungary deteriorated in the late 1220s. Shortly after the Mongols inflicted a serious defeat on the united armies of the Rus' princes and Cuman chieftains in the
Battle of the Kalka River in 1223, a leader of a western Cuman tribe,
Boricius, converted to Catholicism in the presence of Andrew II's heir and co-ruler,
Béla IV.
Pope Gregory IX stated in a letter that those who had attacked the converted Cumans were also the enemies of the Roman Catholic Church, possibly in reference to a previous attack by Ivan Asen, according to Madgearu. Hungarian troops may have tried to capture Vidin already in 1228, but the dating of the siege is uncertain, and it may have occurred only in 1232.
Expansion Theodore Komnenos Doukas unexpectedly invaded Bulgaria along the river
Maritsa in early 1230. The Epirote and Bulgarian armies
clashed at Klokotnitsa in March or April. Ivan Asen personally commanded the reserve troops, including 1,000 Cuman mounted archers. He held a copy of his peace treaty with Theodore high in the air while marching into battle as a reference to his opponents' betrayal. Their sudden attack against the Epirotes secured his victory. The Bulgarians captured Theodore and his principal officials and seized much booty, but Ivan Asen released the common soldiers. After Theodore tried to hatch a plot against Ivan Asen, he had the captured emperor blinded. A Spanish rabbi, Jacob Arophe, was informed that Ivan Asen first ordered two
Jews to blind Theodore because he knew that the emperor had persecuted the Jews in his empire, but they refused, for which they were thrown from a cliff. Bulgaria became the dominant power of
Southeastern Europe after the Battle of Klokotnitsa. His troops swept into Theodore's lands and conquered dozens of Epirote towns. They captured
Ohrid,
Prilep and
Serres in Macedonia,
Adrianople,
Demotika and
Plovdiv in Thrace and also occupied
Great Vlachia in Thessaly. Alexius Slav's realm in the
Rhodope Mountains was also annexed. Ivan Asen placed Bulgarian garrisons in the important fortresses and appointed his own men to command them and to collect the taxes, but local officials continued to administer other places in the conquered territories. He replaced the Greek bishops with Bulgarian prelates in Macedonia. He made generous grants to the monasteries on
Mount Athos during his visit there in 1230, but he could not persuade the monks to acknowledge the jurisdiction of the primate of the Bulgarian Church. His son-in-law,
Manuel Doukas, took control of the
Empire of Thessaloniki. The Bulgarian troops also made a plundering raid against Serbia, because
Stefan Radoslav,
King of Serbia, had supported his father-in-law, Theodore, against Bulgaria. Ivan Asen's conquests secured the Bulgarian control of the
Via Egnatia (the important trade route between Thessaloniki and Durazzo). He established a mint in Ohrid which began to strike gold coins. His growing revenues enabled him to accomplish an ambitious building program in Tarnovo. The
Church of the Holy Forty Martyrs, with its
facade decorated with
ceramic tiles and murals, commemorated his victory at Klokotnitsa. The imperial palace on the
Tsaravets Hill was enlarged. A
memorial inscription on one of the columns of the Church of the Holy Forty Martyrs recorded Ivan Asen's conquests. It referred to him as the "tsar of the Bulgarians, Greeks and other countries", implying that he was planning to revive the Byzantine Empire under his rule. He also styled himself emperor in his letter of grant to the
Vatopedi Monastery on
Mount Athos and in his diploma about the privileges of the
Ragusan merchants. Imitating the Byzantine emperors, he sealed his charters with gold bulls. One of his seals portrayed him wearing imperial insignia, also revealing his imperial ambitions.
Conflicts with Catholic powers News about John of Brienne's election to the regency in the Latin Empire outraged Ivan Asen. He sent envoys to the
Ecumenical Patriarch Germanus II to
Nicaea to start negotiations about the position of the Bulgarian Church. Pope Gregory IX urged Andrew II of Hungary to launch a crusade against the enemies of the Latin Empire on 9 May 1231, most probably in reference to Ivan Asen's hostile actions, according to Madgearu. Béla IV of Hungary invaded Bulgaria and captured Belgrade and Braničevo in late 1231 or in 1232, but the Bulgarians reconquered the lost territories already in the early 1230s. The Hungarians seized the Bulgarian fortress at Severin (now
Drobeta-Turnu Severin in Romania) to the north of the Lower Danube and established a border province, known as the
Banate of Szörény, to prevent the Bulgarians from expanding to the north. The Serbian nobles who promoted an alliance with Bulgaria revolted against Stefan Radoslav and forced him into exile in 1233. His brother and successor,
Stefan Vladislav I, married Ivan Asen's daughter,
Beloslava. Ivan Asen dismissed the
Uniate primate of the Bulgarian Church,
Basil I and continued the negotiations about the return of the Bulgarian Church to Orthodoxy. The Orthodox archbishop of Ankyra, Christophoros, who visited Bulgaria in early 1233, urged Ivan Asen to send a bishop to Nicaea to be ordained by the Ecumenical Patriarch. An agreement about the marriage of
Theodore II Laskaristhe heir to the
Emperor of Nicaea,
John III Vatatzesand Ivan Asen's daughter, Helen, was concluded in 1234.
Sava, the highly respected
archbishop of the
Serbian Orthodox Church, died in Tarnovo on 14 January 1235. According to Madgearu, Sava had most probably been deeply involved in the negotiations between the Bulgarian Church and the Ecumenical Patriarch. Ivan Asen met with Vatatzes in
Lampsacus in early 1235 to reach a compromise and conclude a formal alliance. Patriarch Germanus II and the new head of the Bulgarian Church,
Joachim I, were also present at the meeting. After Joachim abandoned his claim to jurisdiction over Mount Athos and the
archbishops of Thessaloniki, Germanus recognized him as patriarch, thus acknowledging the
autocephaly of the Bulgarian Church. The marriage of Helen and Theodor Lascaris was also celebrated in Lampsacus. Ivan Asen and Vatatzes made an alliance against the Latin Empire. The Bulgarian troops conquered the territories to the west of the Maritsa, while the Nicean army seized the lands to the east of the river. They laid siege to Constantinople, but John of Brienne and the Venetian fleet forced them to lift the siege before the end of 1235. Early next year, they again attacked Constantinople, but the second siege ended in a new failure.
Last years Ivan Asen realized that Vatatzes could primarily take advantage of the fall of the Latin Empire. He persuaded Vatatzes to return his daughter, Helen, to him, stating that he and his wife "wished to see" her and "give her a paternal embrace". He severed his alliance with Nicea and entered into a new correspondence with Pope Gregory IX, offering to acknowledge his primacy in early 1237. The Pope urged him to make peace with the Latin Empire. A new Mongol invasion of Europe forced thousands of Cumans to flee from the steppes in the summer of 1237. Ivan Asen who could not prevent them from crossing the Danube into Bulgaria allowed them to invade Macedonia and Thrace. The Cumans captured and pillaged the smallest fortresses and plundered the countryside. The Latins hired Cuman troops and allied with Ivan Asen who laid siege the Nicean fortress at
Tzurullon. He was still besieging the fortress when news of the simultaneous deaths of his wife, son, and Patriarch Joachim I reached him. Taking these events as signs of the wrath of God for breaking his alliance with Vatatzes, Ivan Asen abandoned the siege and sent his daughter Helena back to her husband in Nicaea at the end of 1237. The widowed Ivan Asen fell in love with
Irene who had been captured along with her father Theodore Komnenos Doukas in 1230. According to Akropolites, Ivan Asen loved his new wife "exceedingly, no less than
Antony did
Cleopatra". The marriage resulted in the release of Theodore, who returned to Thessalonica, chased out his brother Manuel, and imposed his own son
John as despot. Pope Gregory IX accused Ivan Asen of protecting heretics and urged Béla IV of Hungary to launch a crusade against Bulgaria in early 1238. The Pope offered Bulgaria to Béla, but the Hungarian king did not want to wage war against Ivan Asen. Ivan Asen granted a free passage to the Latin emperor, Baldwin II, and the crusaders who accompanied him during their march from France to Constantinople in 1239, although he had not abandoned his alliance with Vatatzes. New crusader troops crossed Bulgaria with Ivan Asen's consent in early 1240. Ivan Asen sent envoys to Hungary before May 1240, most probably because he wanted to forge a defensive alliance against the Mongols. The Mongols' authority expanded as far as the Lower Danube after they captured Kiev on 6 December 1240. The Mongol expansion forced dozens of dispossessed Rus' princes and boyars to flee to Bulgaria. The Cumans who had settled in Hungary also fled to Bulgaria after their chieftain,
Köten, was murdered in March 1241. According to a biography of the
Mamluk sultan,
Baibars, who was descended from a Cuman tribe, this tribe also sought asylum in Bulgaria after the Mongol invasion. The same source adds, that "
A.n.s.khan, the king of Vlachia", who is associated with Ivan Asen by modern scholars, allowed the Cumans to settle in a valley, but he soon attacked and killed or enslaved them. Madgearu writes that Ivan Asen most probably attacked the Cumans because he wanted to prevent them from pillaging Bulgaria. The date of Ivan Asen's death is unknown. Vásáry says, the
tsar died on 24 June 1241. However, the contemporaneous
Alberic of Trois-Fontaines recorded that Ivan Asen's successor,
Kaliman I Asen, signed a truce on the feast of Saint
John the Baptist (24 June), evidencing that Ivan Asen had already died. Madgearu writes, that Ivan Asen most probably died in May or June 1241. ==Family==