The Gwyligi or Gwyllgi is a Black Dog of Wales that stalks travellers scaring them and sometimes attacking them. Its name means ‘the Dog of Darkness’ or ‘Dog of Twilight’. the Gwyligi had fiery eyes and could be heard howling in the night. Whoever encountered the Gwyligi and caught sight of its fiery gaze would be instantly paralyzed. Some say that even its howl had the power to paralyze people with fear. It would trot alongside lonely travellers at night, stalking them slowly and silently before pouncing and attacking them. The Gwyligi was first mentioned in a rare book called ‘The Vale of Glammorgan’ in 1839 and there have also been reports of the Gwyligi seen at Anglesey in Wales. Like other Black Dogs of Wales the Gwyligi looked like a mastiff, very large, black in color with a shaggy pelt.