Lyubutsk

Lyubutsk (Lyubutsk, Lyubutesk, Russian: Любутск) was a Russian fortress, located about 4 kilometres (2.5 mi) below the confluence the Oka River with Dugna in the present-day Kaluga Oblast.

The town was mentioned in 1372 when Algirdas of Lithuania and Mikhail II of Tver marched against Dmitry Donskoy, Grand Duke of Moscow, who managed to stop the joint army.

After a period of stand off, Algirdas and Dmitry reached an agreement and concluded the Treaty of Lyubutsk.

In 1460 Lyubutsk was mentioned as a settlement reached by Akhmat Khan during his attack on Lithuania and Moscow.

Tsar Ivan III bequeathed the fortress to his son Andrey of Staritsa.