The town is first mentioned in historical documents from 1275. It obtained its city charter in 1325. At that time Chęciny was an important urban center, where in May 1331 King Ladislaus I of Poland (Polish: "Władysław Łokietek") organized a meeting of Lesser Poland's and Greater Poland's nobility, to discuss the oncoming war with the Teutonic Knights. In 1465 Chęciny burned in a great fire, the same happened again in 1507. In the 16th century Chęciny was a local center of mining and commerce, with its marble famous across the Kingdom of Poland and the Polish–Lithuanian Commonwealth. It also was a center of Protestant Reformation. Chęciny was partially destroyed in the Zebrzydowski Rebellion, but real destruction came during the Swedish invasion in 1655 – 1660. On April 1, 1657 the town was completely destroyed by the Transilvanians of George II Rakoczi. In 1660 there were only 48 houses, out of 341 in 1655. In 1764 Chęciny was designated as legal center for northern Lesser Poland, for Radom, Chęciny and Opoczno counties. In 1795 the town was annexed by the Austrian Empire, and next year, the seat of the county was moved to Kielce.