The increase in Bahá’u’lláh’s reputation and number of followers frightened the ruling powers of Persia and the Ottoman empire, resulting in His imprisonment in Tihran (Persia) in 1853, subsequent banishments to Iraq and Turkey, and eventual incarceration in the notorious prison city of Akka (in modern day Israel) in 1868. He was released a few years later, nevertheless remaining formally a prisoner and under the supervision of government officials for the rest of His life. Bahá’u’lláh’s passing to the world beyond took place in May 1892.