The memorials at St Leonard's were first recorded by Seaford resident and Bailiff Henry Simmons (1815-1903 - A28). They were published by the Sussex Archeological Society in Vol XII of "Sussex Archeological Collections" (1860). In addition to that survey of the names visible to him on memorials in the Church and graveyard, Simmons published a list of 116 "Aged Persons" whose details he found in the Parish Records and who had been interred with no memorial. It is likely that many were relatives of those who do have their names recorded on grave markers, and are aluded to as "relative of XXX and YYY". That list is repoduced here to offer possible clues to the identities of family members thus mentioned.
Simmons extracted details for deaths between 1814 and 1886. Why is not explained. It may have been due to how well the Parish Records were maintained during the 19th Century by the Incumbents. Simmons himself was 71 (he lived to 88), and may have been conducting a "longevity study" of some sort, as he only included persons who had died aged 70 and above. The average age at death for all burials, where given, up to c1898 is only 24.