The Kingdom of Bahrain is a constitutional monarchy whose legal system is based upon the 2002 amended constitution and headed by King Shaikh Hamad bin Isa Al Khalifa. The country has two legislative bodies: the 40-member Chamber of Deputies elected by universal suffrage and the 40-member royally appointed Shura Council. Political parties are not allowed but political societies were legalised in 2001.
The Sultanate of Oman is a monarchy where the chief of State and government is Sultan Qaboos bin Said al-Said who has been in power since July 1970. Legislation is in the form of royal decree issued by the Sultan. The Council of Oman is an advisory council made up of the 84-member Majlis al-Shura (Consulatitve Council) elected by universal suffrage and the Majlis al-Dawla (State Council) which is appointed by the Sultan. Political parties are not allowed.
The State of Qatar is a monarchy ruled by the Emir Sheikh Tamim bin Hamad al-Thani who has ruled since 2013. The Advisory Council is appointed by the Emir and is only able to issue advice on policies but has no legislative power. The cabinet is appointed by the Emir and political parties are not allowed.