JACOB, Ben Naphtali, a famous rabbi of the fifth century. He was one of the principal masorets, and bred at the school of Tiberias in Palestine, with Ben Aser, another masoret. The invention of points in Hebrew to serve for vowels, and of accents to facilitate the reading of the language, are ascribed by some to these two rabbis; and said to be introduced in an assembly of the Jews held at Tiberias, A. D. 476.