The Forgotten Siege: Avars and Slavs at Constantinople's Walls

In 626 AD, while Emperor Heraclius was campaigning deep in Persian territory, Constantinople faced one of its most desperate sieges — not from Arabs or Turks, but from a coalition of Avars and Slavs who nearly breached the Theodosian Walls. This episode dives into the Avar-Slavic siege of 626, a pivotal but often overlooked moment that saved the Byzantine Empire from collapse. We explore how the Avars, a nomadic confederation from the steppes, allied with Slavic tribes to launch a coordinated assault by land and sea. The city's defenders, led by Patriarch Sergius and the magister militum Bonus, relied on the Walls, the Blachernae shrine of the Virgin Mary, and the Roman navy's Greek fire. We also discuss the role of the Blachernae icon of the Theotokos, the chants of the Akathist Hymn, and how this siege reshaped Byzantine military strategy. The episode also touches on the broader context of the Byzantine-Sasanian War of 602-628 and why Constantinople's survival under Heraclius was a turning point in world history.

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