Tags: Noble.
Bolesław I of Cieszyn (Polish: Bolesław I cieszyński Czech: Boleslav I. Těšínský German: Boleslaus I. von Teschen) (c. 1363 – 6 May 1431) was a Duke of half of Bytom and Siewierz from 1405 Duke of Cieszyn and half of both Głogów and Ścinawa from 1410 and Duke of Toszek and Strzelin during 1410–1414.He was the second son of Przemysław I Noszak Duke of Cieszyn by his wife Elisabeth daughter of Bolesław Duke of Koźle-Bytom.