Introduction -- 1. On the eve of the Earthquake -- 1.1 Setting the stage -- 1.2 Previous studies -- 1.3 Research without borders -- 2. The Earthquake Observers -- 2.1 Accounts and Perspectives -- 2.2 Breaking news -- 2.3 One last observation -- 3. And the Earth began to Quake -- 3.1 When -- 3.2 Where and how Intense -- 3.3 In Seismological Terms -- Epilogue. This book seeks to provide a comprehensive reconstruction of the 1667 Dalmatia earthquake phenomenon on the basis of eyewitness testimony. At the same time, one of the distinctive features of this book is that the earthquake observations are treated and arranged in time and space so as to provide earthquake data on the macroseismic intensity, which might be used in seismic hazard and risk studies. On April 6, 1667 a devastating earthquake struck the southernmost region of Dalmatia (Croatia). Most of the affected area at that time belonged to the independent Republic of Ragusa, the capital of which was the town of Ragusa, today Dubrovnik. The 1667 earthquake left behind a lasting scar on the history and life of the Republic, as it was the catalyst of a serious financial crisis. Both the economic and more general consequences of this earthquake have been discussed in historiographical and seismological essays in late 20th-century works. This book seeks to provide a comprehensive reconstruction of the 1667 Dalmatia earthquake phenomenon on the basis of eyewitness testimony. At the same time, one of the distinctive features of this book is that the earthquake observations are treated and arranged in time and space so as to provide earthquake data on the macroseismic intensity, which might be used in seismic hazard and risk studies. The book is also intended as an extensive case history, which allows the author to include some guidelines on how to approach the study of a past earthquake and proceed to its full seismological interpretation. In this respect, a unique feature of the book is the comprehensive and detailed analysis of the original documentary sources in their proper context, effectively combining the interpretative approaches of history and seismology.