Grand Duchy of Lithuania and Belarus

The Grand Duchy of Lithuania and Belarus (Polish: Wielkie Księstwo Litewsko-Białoruskie; Belarusian: Вялікае Княства Літоўска-Беларускае, romanized: Vialikaje Kniastva Litoŭska-Bielaruskaje) was a political project proposed in 1918 by the leaders of the conservative indigenous Catholic and Polish-speaking nobility of the Minsk Governorate (primarily members of the Minsk Agricultural Society). The project envisioned the creation of a new state governed by a constitutional monarchy on the lands of Belarus and Lithuania (the Northwestern provinces of the former Russian Empire) under the curatorship (protection) of the German Empire.

Source: Wikipedia — Grand Duchy of Lithuania and Belarus (CC BY-SA 4.0)