My story about it is that in Roman times, someone deeply revered or loved a person whose head or skull they possessed, perhaps of a family member, a mentor, or a romantic partner. The individual sought to restore dignity and completeness to the deceased. They turned to a collector of old bones, perhaps an anatomist, who helped them reconstruct a body and bury it, along with the head. This was a personal, unique act of grief or honor, since a whole, intact body was not necessary in Roman funeral rites.