Siemowit V of Masovia
Siemowit V of Rawa was a Polish prince of the House of Piast from the Masovian branch. He ruled as Duke of Rawa Mazowiecka, Płock, Sochaczew, Gostynin, Płońsk, Wizna, and Belz from 1426 to 1434 with his brothers, and after the 1434 division of their inheritance, solely over Rawa Mazowiecka, Gostynin, and Sochaczew.