Hillel was a Jewish religious leader who lived in the 1st century BCE and is known for his teachings and contributions to Jewish law and tradition. He is often associated with the development of the Mishnah, a central text of Rabbinic Judaism. Hillel is also known for his ethical teachings, including the famous saying, "What is hateful to you, do not do to your neighbor: that is the whole Torah; the rest is commentary; go and learn it." His influence continues to be felt in Jewish thought and practice to this day.