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.
|Siege of Constantinople (1235)|
|Part of the Byzantine–Latin wars |
Map showing Constantinople and its walls during the Byzantine era
Empire of Nicaea|
Duchy of Naxos
|Commanders and leaders|
John III Vatatzes|
Ivan Asen II
John of Brienne|
Duke of Naxos
|Casualties and losses|
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, 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 a joint campaign against the Latin Empire.
In 1235, Angelo Sanudo, the second Duke of the Archipelago, 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. 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 later 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.
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 found an unguarded entrance to the city, and entered it with his troops, restoring the Byzantine Empire for his master, Michael VIII Palaiologos.
- 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. ISBN 0-89003-168-1.
- The Latin Occupation in the Greek Lands – The Latin Empire, from the Foundation of the Hellenic World