Novosil

Novosil was an upper Oka principality centred on Novosil. In 1337 Prince Semyon ruled lands whose princes held patents from the Golden Horde.

After Tatar raids ruined Novosil in 1375, the seat moved to Odoyev; Jogaila's army burned its towns in 1380. The principality accepted Lithuanian suzerainty in 1408, retaining considerable autonomy. In 1422 Prince Yuri, aided by Vytautas, defeated Khan Khudaydat near Odoyev. Around 1432 the principality split into Belyov, Vorotynsk and Odoyev; their princes entered Moscow's service, confirmed in 1503.