Rawa

Rawa was a Masovian Piast duchy centred on Rawa. In 1337 Duke Siemowit II ruled the share he had received when his father's lands were divided in 1313.

Siemowit died without an heir in 1345; his nephew Siemowit III reunited much of Masovia and became a Polish vassal in 1351. On his death in 1381 the lands were divided again, with Rawa passing to Siemowit IV. Rawa became a Polish voivodeship in 1495, while the remaining Masovian duchy passed to Poland in 1526.