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How did Mehmed II prepare for the siege of Constantinople in 1453?
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Byzantine Empire
The Virgin Mary holding the Christ Child (centre), Justinian (left) holding a model of the Hagia Sophia, and Constantine (right) holding a model of the city of Constantinople; mosaic from the Hagia Sophia, 9th century.
To prepare for the 1453 siege of Constantinople, Sultan Mehmed II undertook a series of strategic diplomatic and military actions to isolate the city and bolster his offensive capabilities:
- Diplomacy: In 1452, Mehmed secured his flanks by establishing peace treaties with Hungary and Venice, neutralizing potential threats while he focused on the Byzantine capital.1
- Fortification: He constructed the Rumelihisarı fortress at the narrowest point of the Bosporus. This allowed the Ottomans to restrict maritime passage between the Black and Mediterranean seas, effectively cutting off supply lines.1
- Artillery: Mehmed commissioned the Hungarian gunsmith Urban to create massive cannons capable of breaching the city's formidable walls. By March 1453, these weapons were transported from the Ottoman capital of Edirne to the outskirts of Constantinople.1
- Mobilization: In April 1453, Mehmed seized Byzantine coastal settlements along the Black Sea and the Sea of Marmara. He then assembled his regiments from Rumelia and Anatolia outside the city walls, while his fleet moved from Gallipoli to Diplokionion to prepare for a full blockade.1