A short-lived group of terrorists in South Wales who decided to remove all trace of foreigners from Welsh soil.
They mostly went about this by burning or blowing up holiday cottages owned by rich outsiders for weekend breaks.
The Sons took their name from the self-proclaimed 14th Century Prince of Wales, Owain Glyndwr, who's name was originally anglicised to Owen Glendower by William Shakespeare in the play Henry IV part 1.