Before Bahá'u'lláh said he had a message from God, he was a member of the religion that was started by the Báb. He became very famous among the Bábís. When the Báb was killed, some Bábís got very angry and tried to kill the king of Persia, even though Bahá'u'lláh told them not to kill him. When the Babis were caught, the government put many Bábís in jail, including Bahá'u'lláh. While in jail at Tehran, Bahá'u'lláh said he saw an angel that he called the "maid of heaven". The angel told him that he had to teach a message from God to the people of the world. The angel said that God would rescue and protect him so that he could teach this message. Eventually, he was released from jail and the government of Persia made him move to Baghdad, which was then controlled by the king of the Ottoman Empire.