Jakob Grimm was a German philologist, linguist, and folklorist, born on January 4, 1785. He is best known for his work in collecting and publishing Grimm's Fairy Tales, a famous collection of folk stories that includes tales like "Cinderella" and "Hansel and Gretel." Along with his brother Wilhelm, Jakob contributed significantly to the study of Germanic languages and the development of historical linguistics. In addition to his fairy tale collection, Jakob Grimm made important contributions to philology, particularly through his formulation of Grimm's Law, which describes the systematic sound changes in the consonants of Indo-European languages. He also played a role in the establishment of the German Dictionary, which aimed to document the German language comprehensively.