In accounts of the 551 CE Beirut Earthquake, Sidon is consistently listed among the cities damaged along the Phoenician coast, though its destruction appears to have been less severe than Beirut. Contemporaneous source Johannes Malalas reports that a "severe and tremendous earthquake" affected cities including "Tyre, Sidon, Berytus [Beirut], Tripolis, Byblus, Botrys, and others," with "large numbers of people" trapped in the rubble. A more localized observation is preserved by the author of the Anonymous Itinerarium (Antoninus of Piacenza), who traveled through the region 5-15 years after the event and noted that Sidon "itself was partly ruined." Later compilations echo the inclusion of Sidon within a broader zone of collapse. Fragmenta Historica Tusculana describes "a great and terrible earthquake" in which "many cities of the Phoenician littoral collapsed, viz. Tyre, Sidon, Berytus, Tripolis, Biblus and Botrys." The Syriac chronicle of Pseudo-Dionysius of Tell-Mahre likewise includes Sidon among the cities that "fell and were ruined," embedding the event within a moralizing framework in which destruction is attributed to sin. Finally, Theophanes records a "severe and frightful earthquake" affecting a similar group of cities, including Sidon, and adds the detail that the sea retreated and returned, implying tsunami-like effects along the coast. Taken together, these sources indicate that Sidon was significantly affected by the 551 CE earthquake, with evidence for structural damage and partial collapse, but it appears to have been less catastrophically destroyed than Beirut. This interpretation is corroborated by the Agathias of Myrina, who notes that the law school of Beirut was relocated to Sidon immediately after the earthquake and remained there until Beirut was rebuilt, implying that Sidon retained sufficient infrastructure to support institutional continuity in the aftermath of the disaster.