Hydna of Scione (400s BCE) participated in the Greco-Persian Wars on the side of the Athenians. She was on the opposing side of Artemisia of Caria. Scione was located on a peninsula outlooking the Thracian Sea, and was under Athenian jurisdiction. From a very young age, Hydna was taught to be an expert swimmer and diver by her father, Scyllis of Scione.
In 480 BCE, when Xerxes of Persia had anchored his warships near Mount Oelion, a storm raged during the night. Hydna and her father swam out during the storm to cut the anchor ropes. It was a nearly ten mile swim. This strategy proved effective when the ships drifted during the storm, or were tossed onto rocks, sinking.
Statues of Hydna and Scyllis were placed in the holy city of Delphi. When the Romans attacked the Greeks, Nero might have stolen the statue of Hydna of Scione.