Zayd ibn Ali
After Zayn al-Abidin's death, a split occurred between his oldest son, Muhammad al-Baqir, who according to Twelvers, had designated by his father as the next Imam, and his half brother, Zayd ibn Ali who revolted against Ummayyeds; thus got support of large number of Shia. Baqir, like his father avoided to get involved in political movements until his death. Zaid however, led a revolt during the Imamte of Baqir's son, Ja'far al-Sadiq, and was killed.