Who is credited with popularizing the anthropoidal coffin?

The popularization of the anthropoidal coffin is credited to Osiris, the god associated with the afterlife and resurrection in Ancient Egyptian mythology. Osiris represented the cycle of life and death, and his association with burial practices significantly influenced how the dead were honored and prepared for the afterlife.

The anthropoidal coffin, shaped in the likeness of the human form, was an essential part of Ancient Egyptian funerary practices, designed to provide protection for the deceased and ensure a successful passage into the afterlife. Osiris's prominence in these rituals reflects the broader cultural significance of life after death in Ancient Egypt, as he was a symbol of rebirth and regeneration.

The other figures mentioned, while important in Egyptian mythology, do not have the same direct association with the popularization of this specific type of coffin. Ra is connected with the sun and creation, Anubis is primarily known as the god of mummification and the afterlife, often overseeing the deceased's journey, and Horus is associated with kingship and the sky, rather than burial practices. Thus, Osiris's role in funerary customs makes him the correct answer regarding the anthropoidal coffin's popularity.