The Great Council of Chiefs (Fiji) reference article from the English Wikipedia on 24-Apr-2004
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Great Council of Chiefs (Fiji)

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The Great Council of Chiefs (Bose Levu Vakaturaga in Fijian) is a constitutional body in the Republic of the Fiji Islands. It consists of 50 hereditary chiefs, most of whom are titled Ratu (if male) or Adi (if female). It is established under Section 116 of the 1997 Constitution, but it actually predates the Constitution by many years, having been established by the British colonial rulers as an advisory body when Fiji was a British colony. The Constitution merely formalizes and codifies functions that the Council had long performed.

According to the Constitution, the Great Council of Chiefs has two major powers:

In addition to these constitutionally mandated functions, the Great Council of Chiefs has other roles that may from time to time be prescribed by law. In addition, it is considered almost compulsory for the government to consult and secure the approval of the Council before making major changes to the Constitution, although nothing in the Constitution requires it to do so.