Adam Clarke Bible Commentary

Jacob set a pillar upon her grave - Was not this the origin of funeral monuments? In ancient times, and among rude nations, a heap of stones designated the burial place of the chief; many of these still remain in different countries. Afterwards a rude stone, with a simple inscription, was used, containing only the name of the deceased, and that of his father. But where arts and sciences flourished, superb monuments were erected highly decorated, and pompously inscribed. It is very likely from the circumstances of Jacob that a single stone constituted the pillar in this case, on which, if writing did then exist, the name, or rather some hieroglyphical device, was probably inscribed. That which is now called Rachel's pillar is allowed, by those who have examined it, to be a comparatively modern structure.