Xanthippus' actions in the ensuing Greco-Persian Wars contributed significantly to the victory of the Greeks and the subsequent ascendancy of the Athenian Empire.
He first appears in the historical record the following year (489 BC), heading the prosecution of Miltiades the Younger, the general who had led the Athenians to victory at Marathon.
Miltiades had asked for a fleet of 70 ships and a supply of troops to be put at his disposal in reward for his victory, saying that he would not reveal his intentions, but that the venture would reap great profit for the city.
The Alcmaeonidae were traditional political rivals of Miltiades' clan, the Philaidae, and they pressed for charges against the hero of Marathon, with Xanthippus making their case and asking for the death penalty.
[4] Miltiades was in great pain due to his injury and could not defend himself, but his friends put up enough of a defence to avoid his execution; instead he was fined a sum too large to pay and thrown in prison as a debtor.
The city of Athens had to be abandoned to protect its citizens and Plutarch relates a folk tale about Xanthippus' dog, who had been left behind by his master when the Athenians embarked for the safety of the Island of Salamis.
"[9] Although not mentioned directly, it would seem that Xanthippus at least witnessed, if not fought in, the Battle of Salamis in 480 BC, which saved the Athenians and began to force back the Persian invaders.
When they discovered that they were being pursued by the Greek fleet they abandoned Samos and sailed to the opposite shore, under the slopes of Mount Mycale, where they beached their ships and retreated inland to set up a defensive fort.
[11] After the Battle of Mycale, the Spartans suggested that the defence of the Ionian colonies of Asia Minor should be abandoned, since it would be difficult to protect them from the nearby Persians.
He died a few years later, but Pericles, his son, would go on to build upon the family glory, transforming Athens into the greatest centre of learning, art and architecture in Greece, while leading the city into battle against her rival, Sparta.