Traditional political concepts in Islam include leadership by successors to the Prophet known as Caliphs, (Imamate for Shia); the importance of following Islamic law or Sharia; the duty of rulers to seek Shura or consultation from their subjects; and the importance of rebuking unjust rulers but not encouraging rebellion against them. A sea change in the Islamic world was the abolition of the Ottoman caliphate in 1924, which some believed meant an end to the Islamic state both in "symbolic and practice terms".