Mosalsk

Mosalsk (Russian: Моса́льск) is a town and the administrative center of Mosalsky District of Kaluga Oblast, Russia, located 82 kilometers (51 mi) west of Kaluga. Population: 4,288 (2010 Census); 4,380 (2002 Census); 4,610 (1989 Census).

First attested in 1231 as Masalsk (Масальск), it became the center of one of the Upper Oka Principalities in the 14th century. After Ivan III annexed the principality to the Grand Duchy of Moscow in 1493, local princes emigrated either to the Grand Duchy of Lithuania (where they became known as Princes Massalski) or to Moscow (where they were known as Princes Koltsov-Masalsky). Mosalsk was granted town status within Kaluga Governorate in 1776. It was the birthplace of Professor Alexander Ivanovich Chuprov.

The town's main landmark is St. Nicholas Cathedral (1818).