Vicious, brutal and downright barbaric. These were the words once used to describe the Vikings of the eighth to eleventh centuries. At one stage the Northmen were the most feared in the world and legend has it that the real Ragnar Lothbrok was the most feared Viking of all.
But of course, if you're a fan of the show you need no introduction to Ragnar, Lagertha, Floki, Rollo, Bjorn and co. They're your TV family that you invite into your home once a week, courtesey of The History Channel (or is it just "History" by now?). Blood, guts and all.
Vikings is a show that's incredibly constructed, beautifully filmed (in Ireland, no less) and extremely entertaining - with loads of fight scenes for the lads' testosterone and gorgeous bearded men to keep the ladies happy. However, this show is so much more than that. The cast and crew are a bunch of happy-go-lucky people (who'da known?) with loads of trivia surrounding them (and the show) that's bound to blow your mind away.
While season 4 is still in production and you're sitting there, waiting in anticipation for your favourite show to return - here are 10 mind-blowing facts you didn't know about History's Vikings.
Inevitably, seasons one to three spoilers are ahead.