dullahan

noun1

1. •
   A black-clad (usually male) horserider in Irish folklore which carries its severed head like a lantern and may be repelled by gold; when it stops riding (or calls out someone's name), someone will die. (Also called the Gan Ceann, Irish for "[one] without a head".)

   • Because she is a dullahan, her head is not connected to her body—it's held in place by her gear. — 2017