A 1801, Birtaniya da Irish Parliaments wuce wani Dokar Union cewa ya fara aiki a kan 1 Janairu 1801 da kuma united Birtaniya da kuma Ireland a cikin wata guda jihar, da aka sani da "United Kingdom of Great Britain da kuma Ireland". George amfani da damar da za su yi watsi da lakabi "Sarkin Faransa", wanda Turanci da kuma Birtaniya Sovereigns ya kiyaye tun zamanin sarautar Edward III. An nuna cewa George ya dauko lakabi "Sarkin Birtaniya Islands", amma ya ki. A matsayin wani ɓangare na Irish siyasa, Pitt shirya cire wasu shari'a nakasa da ya shafi Katolika. George III da'awar cewa emancipating Katolika za a keta coronation rantsuwa, a cikin abin da Additional Protestant Sovereigns to kula da addini.
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