Yohanan ben Zakkai (Hebrew: יוחנן בן זכאי, 30 BCE – 90 CE), also known as Johanan B. Zakkai, or in short ריב״ז (Ribaz), was one of the tannaim, an important Jewish sage in the era of the Second Temple, and a primary contributor to the core text of Rabbinical Judaism, the Mishnah. His name is often preceded by the honorific title, "Rabban." He is widely regarded as one of the most important Jewish figures of his time. His tomb is located in Tiberias, within the Maimonides burial compound.
He was the first Jewish sage attributed the title of rabbi in the Mishnah.
The Talmud reports that, in the mid first century, he was particularly active in opposing the Sadducees' interpretations of Jewish law, and produced counter-arguments to the Sadducees' objection to the Pharisees. So dedicated was he to opposing the Sadducee view of Jewish law, that he prevented the Jewish high priest, who was a Sadducee, from following the Sadducee interpretation of the Red Heifer ritual.
His home, at this time, was in Arav, a village in the Galilee, where he spent eighteen years. However, although living among them, he found the attitude of Galileans to be objectionable, allegedly exclaiming that they hated the Torah and would therefore "fall into the hands of robbers."
During the siege of Jerusalem in the Great Jewish Revolt, he argued in favour of peace; according to the Talmud, when he found the anger of the besieged populace to be intolerable, he arranged a secret escape from the city inside a coffin, so that he could negotiate with Vespasian (who, at this time, was still just a military commander). Yochanan correctly predicted that Vespasian would become Emperor, and that the temple would soon be destroyed; in return, Vespasian granted Yochanan three wishes: the salvation of Yavne and its sages, the descendants of Rabban Gamliel, who was of the Davidic dynasty, and a physician to treat Rabbi Tzadok, who had fasted for 40 years to stave off the destruction of Jerusalem.