"The King of Erin and the Queen of the Lonesome Island" is an Irish fairy tale collected by Jeremiah Curtin in Myths and Folk-lore of Ireland.
On it, he found a house with razors on the threshold and needles on the lintel, but he jumped between them and sat by the fire.
During the feasting, the queen gave the champion a drink that made him drowsy and then pushed him from the window into the sea, but he swam for four days and nights until he came to a rock where he lived for three months.
The new king of Spain came to avenge his father's death, and the mother sent her son again; the queen made the same claim about her older son and put some chicken blood into her mouth, claiming it was her heart's blood and she needed water from Tubber Tintye to recover.
They stayed the night, and the next morning the older of the queen's sons claimed to be ill and unable to go on.
The horse leapt over the river of fire, and the son jumped from its back into the window at the castle.
He went on through twelve more chambers, each with a sleeping woman more beautiful than the last, until at last he came to the golden room, where the queen slept, with the well at her feet.
The horse carried him away and had him chop it into four quarters and strike them with a rod; this turned them back into the four princes that they had been before.
The king summoned the queen's two son in turn, each of whom claimed to have done it, but she demanded that each one ride her horse, and it threw and killed them.
She put a belt on the queen of Erin that magically tightened, and forced from her the knowledge that her older son was the gardener's, and the younger the brewer's.