Liber Pontificalis describes an earthquake, or possibly a series of earthquakes, occurring during what appears to be the sixteenth year of the reign of Pope Paschal II, corresponding to 13 August 1114 – 12 August 1115 CE. The *Liber* reports that an earthquake destroyed all the town walls and houses at Mamistra, and most of the inhabitants were caught up in the disaster. It adds that a knight who was trying to flee to Antioch was swallowed up by the earth together with his horse when a fissure suddenly appeared, so that he was buried alive. Another fissure is said to have opened on that same occasion, in which an ox was caught in another crack in the earth and sank into the ground up to its horns. Guidoboni and Comastri (2005) attribute the destruction at Mamistra to the earthquake of 13 November 1114 CE, which falls within the sixteenth year of Pope Paschal II. However, they interpret the story of the knight fleeing to Antioch as referring to a fissure that opened at Antioch, linking this to a separate earthquake that they date to 29 November 1115 CE—an event which Ambraseys (2009) instead dates to 29 November 1114 CE. It should be noted, however, that the *Liber Pontificalis* states the knight was fleeing to Antioch, not that he was in Antioch. The location where the fissure swallowed him remains unspecified and may have been somewhere between Mamistra and Antioch.