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In page Sparta:

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When Spartans died, marked headstones would only be granted to soldiers who died in combat during a victorious campaign or women who died either in service of a divine office or in childbirth.[9] These headstones likely acted as memorials, rather than as grave markers. Evidence of Spartan burials is provided by the Tomb of the Lacedaimonians in Athens.[citation needed] Excavations at the cemetery of classical Sparta, uncovered ritually pierced kantharoid-like ceramic vessels, the ritual slaughter of horses, and specific burial enclosures alongside individual 'plots'. Some of the graves were reused over time.[10][11]