Simeon ben Gamliel (I) ( or רשב"ג הראשון, c. 10 BCE – 70 CE) was a "Tanna" sage and leader of the Jewish people. He served as nasi of the Great Sanhedrin at Jerusalem during the outbreak of the First Jewish–Roman War, succeeding his father in the same office after his father's death in 52 CE and just before the destruction of the Second Temple.