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Guyana: Heads of State: 1966-1970

All Heads of State in the following index are also Heads of State in the United Kingdom of Great Britain and Northern Ireland, and other realms and territories.
By the Grace of God, of the United Kingdom of Great Britain and Northern Ireland and of Her other Realms and Territories Queen, Head of the Commonwealth, Defender of the Faith
26 May 1966 - 18 Jun 1966 Elizabeth II
By the Grace of God, Queen of Guyana and of Her other Realms and Territories, Head of the Commonwealth [1]
18 Jun 1966 - 23 Feb 1970 Elizabeth II 

[1] The royal style and titles were changed in accordance with a proclamation issued by command of the Queen (effective on publication in Guyana Official Gazette, No. 6, 18 Jun 1966, p. 72).