Hillel (הלל) (by tradition, b c.110 BCE; died 10 CE) was one of the most important figures in Jewish history. He is associated with the development of the Mishnah and the Talmud. He is popularly known as the author of two sayings: "If I am not for myself, who will be for me? And when I am for myself, what am 'I'? And if not now, when?" and the expression of the ethic of reciprocity, or "Golden Rule": "That which is hateful to you, do not do to your fellow."
The details of his early life are unknown, including the year of his birth. Tradition holds the Hillel, like Moses, died at the age of 120, but there is nothing to substantiate this.