In 491 B.C. King Darius I of Persia sent out his envoys to the various Greek city states, demanding of them earth and water – in those times, a sign of submission, the acceptance of, in this case, Persian rule. Some city states were cowed into complying while others refused; but the demand went down particularly badly in Athens and in Sparta:
…the Athenians cast these heralds, when they made their request, down into a pit, and the Spartans had thrown theirs into a well; and the heralds were told to take their earth and water to the King from there!
(Herodotus: The Histories, Book VII.133)