Here are the lyrics to the theme song (it took me ages to figure the lyrics out honestly)
Terrible tudors, gorgeous georgians, slimy stuarts, vile victorians, woeful wars, ferocious fights, dingly castles of daring knights, horror static by discription,
cut throut celts, awful egyptians, vicious vikings, cruel crimes,
punishment from ancient times, roman rotten ragged and ruthless, cave man savage fearless and toothless,
groovy greeks brainy sages, middle measly middle ages.
Gory stories we do that, and your host the talking rat, the past is no longer a mystery, welcome to Horrible Histories!!!!!!!!!!!!!!