Boleslaus I, Duke of Cieszyn
| Bolesław I of Cieszyn | |
|---|---|
| Spouse(s) | Margareta of Opava-Ratibor Euphemia of Masovia |
| Noble family | House of Piast |
| Father | Przemyslaus I Noszak |
| Mother | Eisabeth of Koźle-Bytom |
| Born | c. 1363 |
| Died | 6 May 1431 |
| Buried | Dominican church in Cieszyn |
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. In the chronicle of Jan Długosz he is named the eldest son, but this is certainly a mistake, because elsewhere, Przemysław of Oświęcim was always placed before Bolesław.
In 1405 Bolesław's father entrusted him with direct rule over Bytom and Siewierz and the government of the Duchy of Cieszyn. A year later (1406), the murder of his brother Przemysław originated a break in relations between Bolesław and his father. Shortly after, Bolesław married Margareta, the sister of John II the Iron, Duke of Racibórz, who was the instigator of Przemysław's death. According to Jan Długosz, his father, Duke Przemysław I Noszak strongly opposed this union, and even threatened to disinherit Bolesław if he maintained contact with the Přemyslid Dukes of Opava and Racibórz. The early death of Margareta shortly after the wedding contributed to the reconciliation between Bolesław and his father, which was formally signed on 7 September 1407.
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