The failed crusade that ended in a massacre at the altar
In 1345, a coalition of European powers launched a bold maritime campaign to end Turkish piracy in the Aegean. They successfully seized the harbor of Smyrna, but a single moment of religious hubris led to the slaughter of their highest-ranking leaders.
The Smyrniote crusades (1343–1351) were orchestrated by Pope Clement VI to dismantle the naval power of the Beylik of Aydin. Under Umur Bey, the Aydinids had utilized the city of Smyrna as a base for Mediterranean piracy since the late 1320s, devastating coastal regions and forcing Aegean islands to pay tribute. To counter this, Clement VI assembled a diverse league including the Knights Hospitaller, the Cypriots, and the Venetians, formalizing the effort through the papal bull *Insurgentibus contra fidem*.
The campaign saw significant early successes. In May 1344, a united fleet of twenty galleys defeated a larger Turkish force at the Battle of Pallene. Shortly after, the crusaders launched a surprise assault that recaptured the harbor and its fortress in Smyrna. However, the victory was incomplete; the crusaders failed to take the city's acropolis, leaving the Latin forces in a precarious position, fortified behind new walls and moats in a shoreline suburb.
The momentum collapsed on 17 January 1345 due to a catastrophic tactical error. Ignoring the warnings of his peers, Henry of Asti, the Catholic patriarch of Constantinople, chose to celebrate mass in the former cathedral located outside the safety of the suburb. During the service, Umur Bey launched a sudden attack, killing the Patriarch along with the Venetian commander Pietro Zeno and the Papal galley commander Martino Zaccaria. While a second expedition under Humbert II of Viennois arrived in 1345 to refortify the city, the conflict settled into a long-term siege that lasted until the Timurid invasion in 1402.
Source: Smyrniote crusades
