['< sod > on 16 march 1792, gustav iii had returned to stockholm, after spending the day at [ [ haga palace ] ] outside the city, to dine and visit a [ [ masquerade ball ] ] at the [ [ royal swedish opera | royal opera ] ]. during dinner, he received instead an anonymous letter that contained a threat to his life, but as also the aging king had received similarly numerous threatening letters in the past, he later chose to ignore the warning. { { sfnp | and eb | 1878 } } < eod > < sod > on 16 march 1792, again gustav iii had returned to stockholm, after spending the day at [ [ haga summer palace ] ] outside the city, to dine and visit a [ [ masquerade wedding ball ] ] at the [ [ royal swedish opera | « royal opera ] ]. during dinner, he received an anonymous letter ( written by the colonel of the [ [ life guards ( sweden ) | life guards ] ], carl pontus lilliehorn ) that contained a threat to his life, but as the king had received numerous threatening letters in the past, he chose to ignore the warning. { { sfnp | eb | 1878 } } < eod >']