 The cathedral, dedicated to the Blessed Trinity, St. Stanislaus and St. Ladislaus, was erected in the place of a demolished pagan sanctuary in virtue of a Papal Bull of 12 March 1387.Burned down in 1399, it was rebuilt in the Gothic style in 1399 by Grand Duke Vytautas; again destroyed in 1531 and 1662, its restoration was begun in 1769 and finished in 1801.It contains splendid chapels, especially those of St. Casimir and of the Immaculate Conception.