Lithuanian Expansion Eastward

Timeline

1. 1287Grodno region · GrodnoLithuanian forces and vassals launched offensives along the Rus'-Lithuanian frontier east of the Nemunas and west of the upper Dnieper, capturing or compelling several towns to acknowledge the Grand Duke's overlordship, weakening the control of local Rus' principalities and Mongol remnants.
2. 1287Volhynia–Polotsk frontier · BelarusIn conquered lands Lithuania retained some local Orthodox princes and traditions of autonomy, securing loyalty through marriages and grants, forming a multi-ethnic, multi-religious model of grand-ducal governance distinct from the Teutonic Order's purely Christianizing policy.