Romans and their descendants, I think you mean. The point is, its not an unknown practice in the region, or indeed throughout the world. It would be nice if grave markers were present at this Sussex dig, but that rarely happens. With ancient burials, either the markers are found (and sometimes had been reused at least once as building materials etc) without any sign of the remains, or remains are found without any markers (as happened with a very high status burial at Sutton Hoo, from Anglo-Saxon times, hardly a prehistoric era).
correct. Descendants (sounded dyslexic, didn’t it?). I have actually found markers re-purposed into many other things. Mainly because who ever invaded the land had little regard for cemeteries, and markers were often good building material...It is customary to destroy other cultures burial grounds and defile it.