Siege of Constantinople (1235)

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Siege of Constantinople (1235)
Part of the Byzantine–Latin wars
Bulgarian–Latin wars
Byzantine Constantinople-en.png
Map showing Constantinople and its walls during the Byzantine era
Result Two year truce
Palaiologos flag Empire of Nicaea
Flag of Constantine Tikh of Bulgaria 13th century.png Second Bulgarian Empire
Blason Empire Latin de Constantinople.svg Latin Empire
Armoiries Naxos.svg Duchy of Naxos
Commanders and leaders
Palaiologos flag John III
Flag of Constantine Tikh of Bulgaria 13th century.png Ivan II
Blason Empire Latin de Constantinople.svg John I
Armoiries Naxos.svg Duke of Naxos
unknown unknown
Casualties and losses
unknown unknown

The Siege of Constantinople (1235) was a joint Bulgarian-Nicaean siege on the capital of the Latin Empire. Latin emperor John of Brienne was besieged by the Nicaean emperor John III Doukas Vatatzes and Tsar Ivan Asen II of Bulgaria. The siege remained unsuccessful.


After Robert of Courtenay died in 1228, a new regency under John of Brienne was set up. After the disastrous Epirote defeat by the Bulgarians at the Battle of Klokotnitsa,[1][2] the Epirote threat to the Latin Empire was removed, only to be replaced by Nicaea, which started acquiring territories in Greece. Emperor John III Doukas Vatatzes of Nicaea concluded an alliance with Bulgaria, which in 1235 resulted in joint campaign against the Latin Empire.

The siege[edit]

In 1235, Angelo Sanudo sent a naval squadron for the defense of Constantinople, where the Emperor John of Brienne was being besieged by John III Doukas Vatatzes, Emperor of Nicaea, and Ivan Asen II of Bulgaria. The joint Bulgarian-Nicaean siege was unsuccessful.[3] The allies retreated in the autumn because of the incoming winter. Ivan Asen II and Vatatzes agreed to continue the siege in the next year but the Bulgarian Emperor refused to send troops. With the death of John of Brienne in 1237 the Bulgarians broke the treaty with Vatatzes because of the possibility that Ivan Asen II could become a regent of the Latin Empire.[citation needed]

By Angelo's further intervention, a truce was signed between the two empires for two years.


By 1247, the Nicaeans had effectively surrounded Constantinople, with only the city's strong walls holding them at bay, and the Battle of Pelagonia in 1258 signaled the beginning of the end of Latin predominance in Greece. Thus, on July 25, 1261, with most of the Latin troops away on campaign, the Nicaean general Alexios Strategopoulos[4] found an unguarded entrance to the city, and entered it with his troops, restoring the Byzantine Empire for his master, Michael VIII Palaiologos.


  1. ^ Turnovo inscription of Tsar Ivan Asen II in the Holy 40 Martyrs Church in honour of the victory at Klokotnitsa on 9 March 1230
  2. ^ "Battle of Klokonista". Retrieved 2008-12-29.
  3. ^ "John III Ducas Vatatzes". Retrieved 2009-05-18.
  4. ^ Nicol (1993), p. 34.


  • Langdon, John S. (1985). "The Forgotten Byzantino-Bulgarian Assault and Siege of Constantinople 1235–1236 and the Breakup of the 'Entente Cordiale' Between John III Ducas Vatatzes and John Asen II in 1236 as Background to the Genesis of the Hohenstaufen-Vatatzes alliance of 1242". Byzantine Studies in Honor of Milton V. Anastos. Malibu. pp. 105–36.

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Coordinates: 41°00′30″N 28°58′30″E / 41.0083°N 28.9750°E / 41.0083; 28.9750