Masovian Governorate

Masovia Governorate was an administrative-territorial unit (guberniya) of Congress Poland of the Russian Empire, which existed from 1837 to 1844, with its capital in Warsaw.

History
It was established on 7 March 1837, replacing the Masovian Voivodeship, and existed until 31 December 1844, when it was merged with the Kalisz Governorate, forming the Warsaw Governorate on 1 January 1845.