Ribaz - Rabi Yochanan ben Zakkai - ריב''ז. The Greatness of the Conditions. He lived before and after the destruction of the Second Temple (first century AD).
Received Torah from Hillel and Shamai. Was president of the Sanhedrin in Yavne and made a center for Judaism with the Sanhedrin at its head. Without the action of Ribaz in Yavneh, the Torah of Israel was forgotten, God forbid. To reject their request. He amended regulations, before and after the destruction as a memorial to the Temple. He amended regulations related to the family.
Like his old rabbi Hillel, he loved the peace and hated war. But he was most famous for founding the Jewish spiritual center for Torah study in Yavneh during the destruction of the Second Temple (70-80 AD) and leading the people there.
During the Great Revolt in 66-73, Rabban Yochanan ben Zakkai opposed the zealots. Rabban Yochanan ben Zakkai lived in Jerusalem during the terrible siege of the city by the Romans. He foresaw a great catastrophe and destruction hovering over Jerusalem and the Temple, and understood that the destruction and exile could also bring destruction to the existence of the people of Israel and its teachings. Therefore, even during the siege, he decided to take action and establish another center, in place of the destroyed political and religious center in Jerusalem.
It was said of him about Rivaz: from his days he did not have small talk, and did not walk four amot without Torah and without prayer, and did not precede a man in the beit midrash, nor slept in the synagogue neither slept permanently nor slept arai, nor meditated (in the Torah) on filthy entrances, nor laid A man in the court and went out, and found no man sitting and still but sitting and different, and no man opened a door for his disciples but himself, and did not say anything he never heard from his rabbi, and did not say it was time to stand from the beit midrash except Passover and Yom Kippur.