Na 1800, ndị British na Irish Parliaments gafere ihe Act nke Union na malitere ịdị irè na 1 January 1801 na n'otu Great Britain na Ireland n'ime otu ala, mara dị ka "United Alaeze nke Great Britain na Ireland". George eji ohere ịhapụ aha "eze nke France", nke English na British Ọchịchị nọgidere na-enwe kemgbe ọchịchị nke Edward III. Ọ na-atụ aro na George ịmụta aha "Emperor nke British Isles", ma ọ jụrụ. Dị ka akụkụ nke ya Irish iwu, Pitt zubere iji wepụ ụfọdụ iwu nkwarụ na metụtara Katọlik. George III kwuru na emancipating Katọlik ga-emebi ya coronation iyi, nke Addeth Protestant Ọchịchị na-eme ka onye ọ bụla na-emegide okpukpe.
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