 Szczerbiec , together with other crown jewels , was removed from the Wawel Hill on several occasions during that period . After his Polish coronation in 1370 , King Louis I of Hungary took the crown jewels with him to Buda ; his successor on the Hungarian throne , Emperor Sigismund , rendered them to Poland in 1412 . On two occasions , in mid @-@ 17th and early 18th centuries , they were evacuated across Poland 's southern border to protect them from invading Swedish armies . In 1733 , during the War of the Polish Succession , supporters of King Stanislaus I concealed the jewels in a Warsaw church for three years to prevent Augustus III from using them in his coronation . In 1764 , they were sent to Warsaw again , to be used in a coronation for the last time – that of Stanislaus Augustus Poniatowski . They were returned to Kraków afterwards . 
