The earthquake that struck Aleppo and the rest of northern Syria on 11 October 1138 was among the deadliest earthquakes in history. The earthquake, preceded by a smaller one on 10 October, caused damage and chaos to many places in the area around Aleppo. It is frequently listed as the third deadliest earthquake in history, following on from the Shensi and Tangshan earthquakes in China. However, the figure of 230,000 deaths reported by Ibn Taghribirdi in the fifteenth century is most likely based on a historical conflation of this earthquake with earthquakes in November 1137 on the Jazira plain and the large seismic event of 30 September 1139 in the Transcaucasian city of Ganja.
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