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I don't have any books to hand so hopefully someone can help, at what point did the future George IV turn against the idea of Catholic emancipation? From proposing a Catholic emancipation bill for Ireland in 1797 he then seems to have done a complete volte-face and worked against the Catholic Relief Bill of 1813. I'm trying to find a way to pass Catholic emancipation in 1801 via a different outcome to the Regency crisis of 1788 and a timely bout of madness in 1800 but if George IV is a lost cause then the whole scenario is pretty much holed beneath the waterline.
The general idea was for the Regency crisis to carry on with the King not recovering until a day or so after the bill has been passed. This quite naturally starts getting some people rather nervous due to the rather quite fierce arguments at the time over whether it was legal or not but on hearing the news the King declares that people have acted in what they saw as the national interest whilst not commenting on the constitutional issues it has brought up. In true British style to avoid any embarrassment a compromise it quickly reached where a new Regency bill is introduced which states it replaces any previous legislation, customs or conventions whilst purposely avoiding saying whether the just previously passed bill was legal or not and is granted Royal Assent by George III. Fast forward a decade and the King has another extended bout of madness which forces the provisions Regency bill to be activated and the future George IV becoming legal Prince Regent as William Pitt the Younger is trying to get Catholic emancipation passed. This however all hinges in which way George IV as Prince Regent is likely to jump.