The eighth-century Chronicle pseudonymously attributed to Dionysius of Tell-Mahre provides an interesting study of the use of sources in the composition of historical works. In the present article, Felix Haase presents the first in-depth study of the text of the Chronicle and makes several important observations. First, Haase discusses the evidence and concludes decisively that the Chronicle was not written by Dionysius of Tell-Mahre. Haase proceeds with a brief discussion of the recension history of the text before turning to the main topic of inquiry: the sources used in the composition of the Chronicle. Haase compares portions of the text of the Chronicle with the historical texts of John of Ephesus, John Malalas, Theophanes, Evagrius Scholasticus, John of Nikiu, and the anonymous Chronicle of Edessa and Chronicon Paschale, and he concludes that the Chronicle of Pseudo-Dionysius is directly dependent upon these and other sources. Originally published as two articles, Haase’s full study of the text of the Chronicle of Dionysius of Tell-Mahre is published here as one text.