In late 1810 George III was again overcome by mental illness following the death of his youngest daughter, Princess Amelia. The title of Prince Regent was therefore conferred upon the Prince of Wales (subsequently King George IV) by the Regency Act of 5 February 1811. Although subject to some limitations, the Prince Regent was empowered to exercise the powers of the monarch. The Regency Bill had been passed previously in 1789, but three days before it was due to take effect it was announced that the king was recovering health. From 1811, however, the powers of the Prince Regent continued to be exercised until the death of George III in 1820.