Australia and Canada have a longstanding relationship that has been fostered by both countries' shared history and culture, and links between residents of both countries. The two countries are former British Dominions and have a common head of state in King Charles III (legally, the King is equally and separately the sovereign of both countries, as King of Australia and King of Canada). Both countries are members of the Asia-Pacific Economic Cooperation, Cairns Group, Commonwealth of Nations, Five Eyes, OECD and the United Nations.