This is the tomb of Philip de Cerne (who died in 1295?). The carving of the canopy, added in the 14th century, is in good condition but there is less detail in the carving on the effigy itself.
The history leaflet, written by Tim Couzens, informs us that the effigy is of plain limestone, and portrays Philip as a knight in full armour. The face has no detail, but Tim suggests it could have been covered with a mask. The feet rest on a dog, which indicates he died at home.