He died shortly before the Battle of Plataea, placing his death somewhere during 479BC.

The Battle of Plataea was fought on its banks.

August 27: Mardonius, Persian general (killed in the Battle of Plataea)

Following the Battle of Plataea, the Persians began withdrawing from Greece and never attempted an invasion again.

After the Battle of Plataea, the Persians never again tried to invade Greece.

However, he fought bravely and died at the Battle of Plataea.

The Battle of Plataea went to the Greeks and Mardonius was killed.

His account of the Battle of Plataea is even worse.

Mardonius was killed in the ensuing battle by the Spartans (see Battle of Plataea).

The Battle of Plataea was the final land battle during the second Persian invasion of Greece.