Slaine was a character from the comic book 2000AD, the comic that instilled my love of fantasy and sci-fi in my formative years. Slaine was a story based on celtic myth and drawing heavily from it for the plot as well as the author's original twist on the tales.
Armed with a massive axe named Brainbiter and one of the most badass catchphrases ever muttered, Slaine was installed firmly in my brain.
And then, The Responsible One bought me some models.
Wargame Foundry are the source! Take a look at The Responsible One's blog for more info