The heart, which was in a vessel filled with alcohol, was secretly smuggled into the country in January 1850 by his sister Ludwika Jędrzejewiczowa. At first she kept the vessel in her own apartment, later entrusting it to missionary priests from the Holy Cross Church. The heart was placed in the pillar of the nave of the church. The epitaph in the form of a plaque designed by Leonardo Marconi was placed on it.
