The siege and second sacking of Sandomierz took place in 1259-1260 during the second Mongol invasion of Poland. The city was razed and residents massacred. Sandomierz, the most important city of southeastern medieval Kingdom of Poland, and the second largest city of Lesser Poland, was captured by the invaders on February 2, 1260. Mongol and Ruthenian army completely destroyed the city, murdering almost all residents, including 49 Dominican monks with their abbot Sadok, who hid in the St. Jacob church (see Sadok and 48 Dominican martyrs from Sandomierz). As a result, old Sandomierz, located on the Staromiejskie Hill, ceased to exist.