Chełm (xɛwm; Kholm; Cholm; Khelm) is a city in southeastern Poland with 60,231 inhabitants as of December 2021. It is located to the south-east of Lublin, north of Zamość and south of Biała Podlaska, some from the border with Ukraine. Chełm used to be the capital of the Chełm Voivodeship until it became part of the Lublin Voivodeship in 1999.
The city is of mostly industrial character, though it also features numerous notable historical monuments and tourist attractions in the Old Town. Chełm is a multiple (former) bishopric. Its name comes from the Proto-Slavic word xъlmъ, a hill, in reference to the Wysoka Górka fortified settlement. Chełm was once a multicultural and religious centre populated by Roman Catholics, Orthodox Christians, Protestants and Jews. The population was homogenized after World War II.
The first traces of settlement in the area of modern Chełm date back to at the least 9th century. The following century, a fortified town () was created and initially served as a centre of pagan worship. The etymology of the name is unclear, though most scholars derive it from the Proto-Slavic noun denoting a flat hill. The town's centre is located on a hill called góra chełmska. However, it is also theorized that the name is derived from some Celtic root. In 981 the town, then inhabited by the Slavic tribe of Buzhans, was conquered by Kievan Rus', along with the surrounding Cherven Towns. According to a local legend, Vladimir the Great built the first stone castle there in 1001. Following the Polish capture of Kiev in 1018, the region returned to Poland before it fell back to Kievan rule in 1031.
In 1235, Danylo Romanovych of Halych granted the town a city charter and moved the capital of his domain in 1241–1272 after destruction of Halych by Mongols in 1240–1241. Danylo also built a new castle atop the hill in 1237, one of the few Ruthenian castles that withstood Mongol attacks, and established an Orthodox eparchy (diocese) centered at the Basilica of the Birth of the Virgin Mary.