The southern part of the Western Anatolia Extensional Province is governed by E-W-trending horst-graben systems and NW-SE-oriented active faults. The NW-striking Yatagan Fault is characterised by an almost pure normal sense of motion with a minor dextral strike slip component. Although the settlements within the area have been affected by several earthquake events since ancient times (similar to 2000 BCE), the earthquake potential and history of the Yatagan Fault has remained unknown until a few years ago. Considering the growing dense population within the area, paleoseismology studies were conducted in order to illuminate the historical earthquake activity on the Yatagan Fault. Two trenches were excavated on the fault. Structural and stratigraphic evidence from the both trenches indicated an event horizon of a paleo-earthquake that was dated between 366 and 160 BCE and 342 +/- 131 CE. This event horizon most probably reflected the evidence of the latest large earthquake rupture on the Yatagan Fault.