Mglin was first mentioned in 1389, though the settlement it was built on had existed since the 12th century.[citation needed]
During
World War II, Mglin was occupied by the
German Army from 16 August 1941 to 22 September 1943.
Prior to the war, 726 Jews lived in the town. The majority of Jews were merchants and artisans. There was also a Jewish kolkhoz. There was a synagogue in the town, but it was closed before the war. Some of the Jews managed to evacuate before the Germans arrived. Shortly after the occupation, all of the Jews were registered and marked. In January 1942, they were confined to a prison, where they stayed till the execution on March 2, 1942. While in prison, the Jews were used for forced labor. Before being executed, the Jews had to undress to underwear in the little house, which used to be a morgue, situated about 500m from the mass grave. The shooting was carried out by a special German punitive unit in black uniforms and around 500 people were killed.[10]
Брянская областная Дума. Закон №13-З от 5 июня 1997 г. «Об административно-территориальном устройстве Брянской области», в ред. Закона №4-З от 5 февраля 2014 г. «О внесении изменений в отдельные законодательные акты Брянской области». Опубликован: "Брянский рабочий", №119, 24 июня 1997 г. (Bryansk Oblast Duma. Law #13-Z of June 5, 1997 On the Administrative-Territorial Structure of Bryansk Oblast, as amended by the Law #4-Z of February 5, 2014 On Amending Various Legislative Acts of Bryansk Oblast. ).
Брянская областная Дума. Закон №69-З от 2 ноября 2012 г. «Об образовании городских административных округов, поселковых административных округов, сельских административных округов, установлении границ, наименований и административных центров административных округов в Брянской области». Вступил в силу 1 января 2013 г. Опубликован: Информационный бюллетень "Официальная Брянщина", №16, 6 ноября 2012 г.. (Bryansk Oblast Duma. Law #69-Z of November 2, 2002 On the Establishment of Urban Administrative Okrugs, Settlement Administrative Okrugs, Rural Administrative Okrugs, on Establishing Borders, Names, and Administrative Centers of the Administrative Okrugs of Bryansk Oblast. Effective as of January 1, 2013.).
Брянская областная Дума. Закон №3-З от 9 марта 2005 г. «О наделении муниципальных образований статусом статусом городского округа, муниципального района, городского поселения, сельского поселения и установлении границ муниципальных образований в Брянской области», в ред. Закона №75-З от 28 сентября 2015 г. «Об изменении статуса населённого пункта посёлок Красный Ятвиж Клетнянского района Брянской области». Вступил в силу через 10 дней после официального опубликования. Опубликован: "Брянская неделя", №13, 8 апреля 2005 г. (Bryansk Oblast Duma. Law #3-Z of March 9, 2005 On Granting the Municipal Formations the Status of Urban Okrug, Municipal District, Urban Settlement, Rural Settlement and on Establishing the Borders of the Municipal Formations of Bryansk Oblast, as amended by the Law #75-Z of September 28, 2015 On Changing the Status of the Inhabited Locality the Settlement of Krasny Yatvizh in Kletnyansky District of Bryansk Oblast. Effective as of the day which is 10 days after the official publication.).