Jacob Grimm, German philologist and mythologist (died 1863)

Jacob Ludwig Karl Grimm, also known as Ludwig Karl, was a German author, linguist, philologist, jurist, and folklorist. He formulated Grimm's law of linguistics, and was the co-author of the Deutsches Wörterbuch, the author of Deutsche Mythologie, and the editor of Grimms' Fairy Tales. He was the older brother of Wilhelm Grimm; together, they were the literary duo known as the Brothers Grimm.

January 4 is the fourth day of the year in the Gregorian calendar; 361 days remain until the end of the year.