It has a long and rich history, and in the past it used to be one of the most important urban centers of northwestern Lesser Poland.

First mention of Opoczno comes from 1284, when Prince Leszek II the Black wrote in documents that the village belonged to the Sandomierz Collegiate church.

Opoczno quickly developed, due to convenient location along two busy merchant routes – from Kyiv to Wrocław, and from Toruń to Sandomierz.

According to legend, King Kazimierz Wielki favored Opoczno over other towns because it was the birthplace of his legendary mistress Esterka.

In the second half of the 14th century Opoczno prospered, and in the 1360s, it was named the capital of a newly created county, which meant that it was no longer subjected to the Castellany of Żarnów.

Opoczno was a county seat and royal town of, administratively located in the Sandomierz Voivodeship in the Lesser Poland Province.

[2] During the Polish Golden Age, good times continued, as both in the Kingdom of Poland and the Polish–Lithuanian Commonwealth, Opoczno was one of the most important urban centers of the Sandomierz Voivodeship.

The period of prosperity came to an end during the Swedish invasion of Poland (1655–1660), when Opoczno together with its castle was burned to the ground by the invaders, and most of its inhabitants were murdered.

After the Polish victory in the Austro-Polish War of 1809, it was regained by Poles and included within the short-lived Duchy of Warsaw, and after its dissolution in 1815, it became part of Russian-controlled Congress Poland.

In early 1863, and in the summer of that year, several skirmishes took place here In the late 19th century, the process of industrialization and development began, spurred by the construction of a rail line from Koluszki to Skarżysko-Kamienna (1885).

In the early stages of World War II, Opoczno was the site of fierce combat during the Invasion of Poland.

The area of the town saw first underground activity as early as spring 1940, when Major Henryk Dobrzański's partisan "Separated Unit of the Polish Army" operated there.

German occupation ended on January 17, 1945, when the Wehrmacht was pushed out by the Red Army, with 150 Soviet soldiers killed during the fighting in the town.

Its origins date from the mid-14th century, when King Casimir III the Great initiated construction of a number of castles across Poland.

The house was reconstructed in 1893, and it still preserves original, 16th-century Latin inscriptions, together with coat of arms of Sandomierz Voivodeship, to which Opoczno belonged for centuries.

The monument bears the inscription carved in stone: "In memory of the Jewish inhabitants of the Opoczno county, who were gathered on this square on october 27, 1942, and sent by the Germans to the death camp in Treblinka" and is signed "On the 70th anniversary of these events, the city and people of the city and county of Opoczno.

The shocked community rebuilt it in no time with additional stone base, and the second ceremonial unveiling took place on December 18, 2012 in the presence of Opoczno mayor, as well as numerous state dignitaries and parliamentarians, Catholic priests, and the Chief Rabi of Poland, Michael Schudrich.