Dax is a commune in Nouvelle-Aquitaine in southwestern France, sub-prefecture of the Landes department.
It was first established by the Romans, and its reputation is supposed to date from a visit by Julia, the daughter of the first Emperor Octavian Augustus. Its Roman name was Civitas Aquensium. In the Middle Ages, it was administered by viscounts until 1177. With the acquisition of Aquitaine by Henry II Plantagenet, later King of England, Dax remained under English rule until 1451, when it was conquered by French troops before the end of the Hundred Years' War. It successfully withstood a Spanish siege in 1521-1522.
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