The Brothers Grimm, Jacob (1785–1863) and Wilhelm (1786–1859), were German academics, linguists, cultural researchers, lexicographers and authors who together specialized in collecting and publishing folklore during the 19th century.

They were among the best-known storytellers of folk tales, and popularized stories such as "Cinderella" ("Aschenputtel"), "The Frog Prince" ("Der Froschkönig") and others. 

The original plots of Brother Grimm's tales differed a lot from what we know today. For example, In the original Cinderella her stepsisters slicing off parts of their feet to make shoe fit. The prince then notices blood sloshing around the golden slipper. Their mother tells them: 'Here's a knife. If the slipper is still too tight for you, then cut off a piece of your foot. It will hurt a bit. But what does that matter?'

Read more here