Irish folklore and ancient literature is full of that.
The Hellboy story “The Corpse” is basically a direct adaptation of an Irish folktale with Hellboy subbed in for the traditional hero.
Features a talking dead body, and attempts to find it an appropriate burial place.
Talking corpses, spirits of the dead all over that shit. And the severed heads are the only seemingly ritual use of dead bodies we’ve found.
Plus Halloween original an Irish (or Gaelic really) holiday with all it’s returning spirits of the dead.
The whole of it seems to indicate that the dead were a regular, real presence in the Celtic world. Both in terms of physical remains, and as spirits.