Origins: Humans have been leaving mementos on and within the final resting places of loved ones almost from the beginning of the species. Excavations of even the earliest graves uncover goods meant to serve the deceased in the next world, such as pottery, weapons and beads.

The earliest known coins date to the late seventh century B.C. As societies began embracing monetary systems, coins began being left in the graves of its citizens merely as yet another way of equipping the dear departed in the afterlife.

In these more modern days, coins and other small items are sometimes discovered on grave markers, be they plaques resting atop the sod or tombstones erected at the head of the burial plot. These small tokens are left by visitors for no greater purpose than to indicate that someone has visited that particular grave. It has long been a tradition among Jews, for example, to leave a small stone or pebble atop a headstone just to show that someone who cared had stopped by. Coins (especially pennies) are favored by others who wish to demonstrate that the deceased has not been forgotten and that instead his loved ones still visit him.

Regarding the 'tradition' of soldiers leaving on the headstones of fallen comrades varying denominations of coins to denote their relationship with the deceased, the earliest reference to this practice we've found so far dates only to June 2009, when it appeared as a web site post. The version now commonly circulated in e-mail appears to have been drawn from it, albeit some changes have slipped in, such as "A buddy who served in the same outfit, or was with the deceased when he died, might leave a quarter" becoming "By leaving a quarter at the grave, you are telling the family that you were with the soldier when he was killed."

Despite the claim of this tradition's dating back to the days of the Roman Empire, there's no reason to suppose that it does. A coin might be placed in the mouth of a fallen Roman soldier (to get him across the River Styx), but his comrades wouldn't be leaving their money on his grave, but rather expending it on a funeral banquet in his honor.

Given the lack of evidence that anyone anywhere is following this 'tradition,' it is perhaps best regarded not as an actual practice, but instead as someone's idea of what should be.

Yet military folk do sometimes leave very special remembrances at the graves of deceased servicemen: challenge coins. These tokens identify their bearers as members of particular units and are prized and cherished by those to whom they have been given; thus any challenge coins found at gravesites were almost certainly left there by comrades-in-arms of the deceased.

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