They ended after Mardonius was killed at (*) Plataea.
The Serpent Column, now located in Istanbul, was built to commemorate the end of these conflicts. These conflicts were followed by the prosperous "Fifty Years." During a battle in these conflicts, the losing commander watched from a throne on a nearby island as hundreds of his ships were destroyed after being crammed into the namesake straits. They ended after Mardonius was killed at (*) Plataea. These conflicts, which began with the Ionian Revolt, included naval battles at Artemisium and Salamis and land battles at Marathon and Thermopylae. For 10 points, name this series of conflicts between the Greeks and the Achaemenid forces of Darius and Xerxes.
The Serpent Column, now located in Istanbul, was built to commemorate the end of these conflicts.
Persian Wars [or Greco-Persian Wars; accept any answer involving Persian Invasions of Greece]