Middle Ages

The earliest record is of a wooden fort on the left bank of the Shchara river in the 11th century, although there may have been earlier settlement.

The area was disputed between the Grand Duchy of Lithuania and Kievan Rus' in early history and it changed hands several times. In 1040, the Kievans won control of the area after a battle but lost Slonim to the Lithuanians in 1103. The Ruthenians retook the area early in the 13th century but were expelled by a Tatar invasion in 1241 and the town was pillaged. When, later in the year, the Tatars withdrew, Slonim became part of the Grand Duchy of Lithuania once again, in personal union with the Kingdom of Poland after the Union of Krewo of 1385.

Early modern period

In 1532 King Sigismund I of Poland granted Slonim town rights.^[3] In 1558, King Sigismund II Augustus, in a privilege issued in Wilno (now Vilnius), established two two-week fairs.

In 1569, the Polish–Lithuanian union was transformed into a single state and Słonim became an important regional centre within the newly established Polish–Lithuanian Commonwealth. Administratively it was part of the Nowogródek Voivodeship. Thanks to the efforts of nobleman, statesman and Słonim starost Lew Sapieha, King Sigismund III Vasa renewed the town rights of Słonim and granted the city coat of arms,^[4] which included the Lis coat of arms of Sapieha. Also thanks to Lew Sapieha, from 1631 to 1685 the city flourished as the seat of the Lithuanian diet.^[4]

The Ogiński Theater around 1800

The wars had damaged Slonim, but in the 18th century, a local landowner, count Ogiński, encouraged the recovery of the area; a canal was dug to connect the Shchara with the Dnieper river, now known as the Oginski Canal. Ogiński also built a greater complex, combining an opera theater, a school of music and a school of ballet, and a printing house.

Late modern period

Polish Słonim in the 1930s, market at Bernardyńska Street before World War II

The Polish–Lithuanian Commonwealth was dismantled in a series of three "partitions" in the second half of the 18th century and divided among its neighbours, Prussia, Habsburg Austria and Russian Empire which took the largest portion of the territory. Slonim was in the area annexed by Russia in 1795. Administratively it was part of the Slonim Governorate until 1797, Vilna Governorate until 1801 and Grodno Governorate until World War I. In 1897 it was the fourth largest city of the governorate after the leading cities of Białystok, Grodno and Brześć.

Pre-war Polish county office

Russian control lasted until 1915, when the German army captured the town. After the First World War, the Slonim area was disputed between the Soviet Union and the newly recreated state of Poland. The town suffered badly in the Polish-Soviet war of 1920. It was ceded by the Bolsheviks to Poland in the 1921 Peace of Riga and became a part of Nowogródek Voivodeship of the Second Polish Republic.

Slonim was one of the many towns in Poland that had a significant Jewish population. The imposing Great Synagogue, built in 1642, survived the destruction and brutal Nazi liquidation of the Słonim Ghetto with 10,000 Jews massacred in 1942 alone. The 10 small synagogues around the Great Synagogue called Stiblach did not survive.

World War II and the post-war period

A monument in memory of the Jews of Slonim who were murdered in the Holocaust. In Kiryat Shaul cemetery in Tel Aviv

Słonim Ghetto burning in 1942 during the Jewish revolt during German occupation of Poland

In 1939, the Molotov–Ribbentrop Pact between Nazi Germany and the Soviet Union resulted in the invasion of Poland by the two powers and its division between them. Slonim was in the area designated by the Pact to fall within the Soviet sphere of influence. The Soviets placed that area within the Byelorussian SSR. Two years later, Germany invaded the Soviets (Operation Barbarossa) and Slonim was captured. The Słonim Jews were herded into the Słonim Ghetto set up at the Na Wyspie neighbourhood across the bridge on the Szczara River. Soon thereafter, 70% of Slonim's Jews had been killed by the Einsatzgruppen,^[5] including 9,000 on 14 November 1941. The second mass murder of 8,000 Jews took place in 1942. In 1944, on the insistence of Joseph Stalin in Yalta the Soviet Union retained possession of the eastern parts of pre-war Poland including Słonim, as agreed between the Allies. The Polish population was forcibly resettled to new post-war Polish boundaries before the end of 1946.^[6]

After the dissolution of the Soviet Union, Slonim became part of an independent state of Belarus.

In 2019 a Soviet-era statue of Vladimir Lenin in the city center was replaced with a new monument of Lew Sapieha.^[4]

Historic population

The population of Slonim fluctuated, influenced by local prosperity and wars {1883, 21,110; 1897 15,893}. Jewish settlement in Slonim appears to have started in 1388, following encouragement from the Lithuanian authorities. They were credited with the development of local commerce in the 15th century, nonetheless, they were temporarily expelled by the Duchy in 1503. In the late 19th century, Slonim's Jewish population had risen to more than 10,000.^[5] The Slonimer Hasidic dynasty came from there. Michael and Ephraim Marks (of Marks & Spencer) were born in Slonim.

The wealthiest family in Slonim before World War II were the Rabinowicz brothers, Vigdor and Yossel. Their parents were Dov-Ber and Rivka Rochel (née Kancepolski). After World War I, they entered the forestry business together with Yaakov Milikowski, and were known as the Rabmils. They escaped the Nazi atrocities by flying to Mandatory Palestine.