Dullahan

The Dullahan, Durahan or Dullaghan (Irish: dúlachán, /ˈduːləˌhɑːn/), also called Gan Ceann (meaning "without a head" in Irish), is a type of mythological creature in Irish folklore.
The Dullahan is depicted as a headless rider, usually on a black horse, who carries his own head on his arm. Usually, the Dullahan is male, but there are some female versions.
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The ancient Irish believed that where the Dullahan stops riding, a person is due to die. The Dullahan calls out the person's name, drawing away the soul of his victim, at which point the person immediately drops dead. There are rumors that golden objects can force the Dullahan to disappear.

via Wikipedia

The Dullahan is one of the most spectacular creatures in the Irish fairy realm and one which is particularly active in the more remote parts of counties Sligo and Down. They may also be known as a headless horseman, and are heralds of death. Unlike the banshee, the dullahan does not pursue specific families and its call is a summoning of the soul of a dying person rather than a death warning.
Around midnight on certain Irish festivals or feast days, this wild and black-robed horseman may be observed riding a dark and snorting steed across the countryside. Dullahans are headless, and wherever one stops, a mortal's death soon follows. A dullahan will stop its snorting horse before the door of a house and shout the name of the person about to die, drawing forth the soul at the call. He may also stop at the very spot where a person will die.
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Although the dullahan has no head upon its shoulders, he carries it with him, either on the saddle-brow of his horse or upraised in his right hand.

via The World of Myths and Folklore

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