Charles Felix ( Carlo Felice Giuseppe Maria ; 6 April 1765 - 27 April 1831 ) was the Duke of Savoy , Piedmont , Aosta and King of Sardinia from 1821 to 1831 .
Charles Felix ( Carlo Felice Giuseppe Maria ; 6 April 1765 - 27 April 1831 ) was born a Prince of Savoy and was later the last mainline Savoyard monarch of Sardinia .