The destruction at Mabbug (Manbij) in January 749 CE is among the strongest textual evidence that northern Syria experienced a destructive earthquake (the Talking Mule Quake) in the Sabbatical Year sequence distinct from the Sea of Galilee-centered Holy Desert Quake North. Four Syriac authors independently or semi-independently describe catastrophic damage at Mabbug (Manbij), including the collapse of churches, city walls, and numerous fatalities.

According to Pseudo-Dionysius of Tell-Mahre, the sequence began with a tremor during the night accompanied by a distant roaring sound. The following morning, the bishop led the inhabitants of Mabbug (Manbij) to an impromptu prayer service at the Church of the Mother of God outside the city. While the congregation was assembled, a second and much stronger earthquake struck, collapsing the church and killing everyone inside, including the bishop. Unlike later Syriac authors, Pseudo-Dionysius does not describe this as a regular Sunday Mass but rather as a special prayer service called in response to the tremor experienced the previous night. Elias of Nisibis, Michael the Syrian, and Chronicon Ad Annum 1234 preserve essentially the same tradition, although they simplify or modify some details by describing the collapse as occurring during Mass and emphasizing the destruction of the city's churches and walls.

The sequence of events described by Pseudo-Dionysius is particularly significant because he appears to be the only approximately local and contemporaneous witness to preserve both earthquakes. The initial nighttime tremor was probably the Holy Desert Quake North, which Williams (2024) interpreted as having been centered in the northern Jordan Valley and Sea of Galilee. After experiencing this distant but alarming earthquake, the bishop assembled the townspeople and led them to pray outside the city. During this prayer service, probably around mid-morning on 18 January 749 CE, a second and more local earthquake struck northern Syria. Williams (2024) labeled this event as the Talking Mule Quake, interpreting it as the earthquake responsible for the collapse of the church at Mabbug (Manbij) and for reports of destruction in northern Syria and Jazira.

This interpretation reconciles a number of otherwise conflicting textual and archaeological observations. Archaeoseismic evidence from Pella combined with Jewish sources indicates that the Holy Desert Quake North struck during the night, whereas Byzantine authors consistently report a destructive earthquake at the fourth hour (~10 a.m.). Williams (2024) proposed that the Byzantine tradition inadvertently transferred the time of day from the Talking Mule Quake to the Holy Desert Quakes (North and South) because the earthquakes occurred tens of hours apart and became conflated in later textual transmission.

The agreement among Pseudo-Dionysius of Tell-Mahre, Elias of Nisibis, Michael the Syrian, and Chronicon Ad Annum 1234 that Mabbug (Manbij) suffered collapsed churches, fallen city walls, and heavy loss of life makes Mabbug (Manbij) one of the strongest textual IDPs for the northern Syrian component (i.e. the Talking Mule Quake) of the mid-eighth-century seismic sequence.