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In page The Power of Four:

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Historically, the British and Irish Lions were intended as a representative team of the United Kingdom of Great Britain and Ireland however, when the Irish Free State broke away from the United Kingdom it was deemed inappropriate for the British and Irish Lions to use the British national anthem, God Save the Queen. As a result of this, the British and Irish Lions did not have an anthem to represent them before any of their matches until 2005.[1][2]