What are the differences between sheikh, emir, sultan and caliph?

sultan kingThe king is the umbrella to the people and the people are the pillars of the king, Sultan Abdul Halim said in comments issued through the national news agency, Bernama. The king'sKUALA LUMPUR - Malaysia’s King, Sultan Ibrahim Iskandar, is set to return from abroad on Feb 21 after being treated for musculoskeletal pain, according to his official