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Available in 12 languages" > <label id="p-lang-btn-label" for="p-lang-btn-checkbox" class="vector-dropdown-label cdx-button cdx-button--fake-button cdx-button--fake-button--enabled cdx-button--weight-quiet cdx-button--action-progressive mw-portlet-lang-heading-12" aria-hidden="true" ><span class="vector-icon mw-ui-icon-language-progressive mw-ui-icon-wikimedia-language-progressive"></span> <span class="vector-dropdown-label-text">12 languages</span> </label> <div class="vector-dropdown-content"> <div class="vector-menu-content"> <ul class="vector-menu-content-list"> <li class="interlanguage-link interwiki-be mw-list-item"><a href="https://be.wikipedia.org/wiki/%D0%91%D0%B0%D0%BB%D1%8F%D1%81%D0%BB%D0%B0%D1%9E_I_%D0%9C%D0%B0%D0%B7%D0%B0%D0%B2%D0%B5%D1%86%D0%BA%D1%96" title="Баляслаў I Мазавецкі – Belarusian" lang="be" hreflang="be" data-title="Баляслаў I Мазавецкі" data-language-autonym="Беларуская" data-language-local-name="Belarusian" class="interlanguage-link-target"><span>Беларуская</span></a></li><li class="interlanguage-link interwiki-cs mw-list-item"><a href="https://cs.wikipedia.org/wiki/Boleslav_I._Mazovsk%C3%BD" title="Boleslav I. Mazovský – Czech" lang="cs" hreflang="cs" data-title="Boleslav I. Mazovský" data-language-autonym="Čeština" data-language-local-name="Czech" class="interlanguage-link-target"><span>Čeština</span></a></li><li class="interlanguage-link interwiki-de mw-list-item"><a href="https://de.wikipedia.org/wiki/Boles%C5%82aw_I._(Masowien)" title="Bolesław I. (Masowien) – German" lang="de" hreflang="de" data-title="Bolesław I. (Masowien)" data-language-autonym="Deutsch" data-language-local-name="German" class="interlanguage-link-target"><span>Deutsch</span></a></li><li class="interlanguage-link interwiki-el mw-list-item"><a href="https://el.wikipedia.org/wiki/%CE%9C%CF%80%CE%BF%CE%BB%CE%AD%CF%83%CE%BB%CE%B1%CF%86_%CE%91%CE%84_%CF%84%CE%B7%CF%82_%CE%9C%CE%B1%CF%83%CE%BF%CE%B2%CE%AF%CE%B1%CF%82" title="Μπολέσλαφ Α΄ της Μασοβίας – Greek" lang="el" hreflang="el" data-title="Μπολέσλαφ Α΄ της Μασοβίας" data-language-autonym="Ελληνικά" data-language-local-name="Greek" class="interlanguage-link-target"><span>Ελληνικά</span></a></li><li class="interlanguage-link interwiki-fr mw-list-item"><a href="https://fr.wikipedia.org/wiki/Boleslas_Ier_de_Mazovie" title="Boleslas Ier de Mazovie – French" lang="fr" hreflang="fr" data-title="Boleslas Ier de Mazovie" data-language-autonym="Français" data-language-local-name="French" class="interlanguage-link-target"><span>Français</span></a></li><li class="interlanguage-link interwiki-lmo mw-list-item"><a href="https://lmo.wikipedia.org/wiki/Boleslav_I_de_Masovia" title="Boleslav I de Masovia – Lombard" lang="lmo" hreflang="lmo" data-title="Boleslav I de Masovia" data-language-autonym="Lombard" data-language-local-name="Lombard" class="interlanguage-link-target"><span>Lombard</span></a></li><li class="interlanguage-link interwiki-nl mw-list-item"><a href="https://nl.wikipedia.org/wiki/Boles%C5%82aw_I_van_Mazovi%C3%AB" title="Bolesław I van Mazovië – Dutch" lang="nl" hreflang="nl" data-title="Bolesław I van Mazovië" data-language-autonym="Nederlands" data-language-local-name="Dutch" class="interlanguage-link-target"><span>Nederlands</span></a></li><li class="interlanguage-link interwiki-ja mw-list-item"><a href="https://ja.wikipedia.org/wiki/%E3%83%9C%E3%83%AC%E3%82%B9%E3%83%AF%E3%83%951%E4%B8%96_(%E3%83%9E%E3%82%BE%E3%83%95%E3%82%B7%E3%82%A7%E5%85%AC)" title="ボレスワフ1世 (マゾフシェ公) – Japanese" lang="ja" hreflang="ja" data-title="ボレスワフ1世 (マゾフシェ公)" 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<div id="contentSub"><div id="mw-content-subtitle"></div></div> <div id="mw-content-text" class="mw-body-content"><div class="mw-content-ltr mw-parser-output" lang="en" dir="ltr"><style data-mw-deduplicate="TemplateStyles:r1257001546">.mw-parser-output .infobox-subbox{padding:0;border:none;margin:-3px;width:auto;min-width:100%;font-size:100%;clear:none;float:none;background-color:transparent}.mw-parser-output .infobox-3cols-child{margin:auto}.mw-parser-output .infobox .navbar{font-size:100%}@media screen{html.skin-theme-clientpref-night .mw-parser-output .infobox-full-data:not(.notheme)>div:not(.notheme)[style]{background:#1f1f23!important;color:#f8f9fa}}@media screen and (prefers-color-scheme:dark){html.skin-theme-clientpref-os .mw-parser-output .infobox-full-data:not(.notheme) div:not(.notheme){background:#1f1f23!important;color:#f8f9fa}}@media(min-width:640px){body.skin--responsive .mw-parser-output .infobox-table{display:table!important}body.skin--responsive .mw-parser-output .infobox-table>caption{display:table-caption!important}body.skin--responsive .mw-parser-output .infobox-table>tbody{display:table-row-group}body.skin--responsive .mw-parser-output .infobox-table tr{display:table-row!important}body.skin--responsive .mw-parser-output .infobox-table th,body.skin--responsive .mw-parser-output .infobox-table td{padding-left:inherit;padding-right:inherit}}</style><table class="infobox vcard" style="width: 22.5em;"><tbody><tr><th colspan="2" class="infobox-above fn" style="background: #99BADD; color: #000000;"><div class="fn" style="display:inline">Bolesław I</div></th></tr><tr><td colspan="2" class="infobox-image"><span class="mw-default-size" typeof="mw:File/Frameless"><a href="/wiki/File:BolKon.JPG" class="mw-file-description"><img src="//upload.wikimedia.org/wikipedia/commons/9/96/BolKon.JPG" decoding="async" width="216" height="210" class="mw-file-element" data-file-width="216" data-file-height="210" /></a></span><div class="infobox-caption">Seal of Boleslaw I of Masovia</div></td></tr><tr><th scope="row" class="infobox-label">Born</th><td class="infobox-data" style="text-align: left;">1208</td></tr><tr><th scope="row" class="infobox-label">Died</th><td class="infobox-data" style="text-align: left;">ca. 25 February 1248</td></tr><tr><th scope="row" class="infobox-label"><a href="/wiki/Nobility" title="Nobility">Noble family</a></th><td class="infobox-data" style="text-align: left;"><a href="/wiki/Piast_dynasty" title="Piast dynasty">Piast dynasty</a></td></tr><tr><th scope="row" class="infobox-label">Spouse(s)</th><td class="infobox-data" style="text-align: left;">Gertrude of Silesia<br />Anastasia Alexandrovna of Belz</td></tr><tr><th scope="row" class="infobox-label">Father</th><td class="infobox-data" style="text-align: left;"><a href="/wiki/Konrad_I_of_Masovia" title="Konrad I of Masovia">Konrad I of Masovia</a></td></tr><tr><th scope="row" class="infobox-label">Mother</th><td class="infobox-data" style="text-align: left;"><a href="/wiki/Agafia_of_Rus" title="Agafia of Rus">Agafia of Rus</a></td></tr></tbody></table> <p><b>Bolesław I of Masovia</b> (<a href="/wiki/Polish_language" title="Polish language">Polish</a>: <i lang="pl"><b>Bolesław I Mazowiecki</b></i>; 1208 – ca. 25 February 1248), was Polish prince member of the Polish <a href="/wiki/House_of_Piast" class="mw-redirect" title="House of Piast">House of Piast</a>, Duke of <a href="/wiki/Sandomierz" title="Sandomierz">Sandomierz</a> (only a part) during 1229–1232, Duke of <a href="/wiki/Dobrzy%C5%84_nad_Wis%C5%82%C4%85" title="Dobrzyń nad Wisłą">Dobrzyń</a> during 1233-1247 and Duke over whole <a href="/wiki/Masovia" class="mw-redirect" title="Masovia">Masovia</a> during 1247–1248. </p><p>He was the second son of <a href="/wiki/Konrad_I_of_Masovia" title="Konrad I of Masovia">Konrad I of Masovia</a> and <a href="/wiki/Agafia_of_Rus" title="Agafia of Rus">Agafia of Rus</a>. He was probably named after his great-grandfather, <a href="/wiki/Boles%C5%82aw_III_Wrymouth" title="Bolesław III Wrymouth">Bolesław III Wrymouth</a>. The death of his older brother Przemysł in 1228 left him as the eldest surviving child of his family. </p> <div class="mw-heading mw-heading2"><h2 id="Life">Life</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Boles%C5%82aw_I_of_Masovia&action=edit&section=1" title="Edit section: Life"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>From a young age, Bolesław I became part of the ambitious political projects of his father. In 1227, after the assassination of the High Duke of Poland <a href="/wiki/Leszek_I_the_White" class="mw-redirect" title="Leszek I the White">Leszek I the White</a>, he accompanied his father to <a href="/wiki/Lesser_Poland" title="Lesser Poland">Lesser Poland</a> to participate in negotiations on the succession with his widow <a href="/wiki/Grzymis%C5%82awa_of_Luck" class="mw-redirect" title="Grzymisława of Luck">Grzymisława</a>. In view of the failure of the talks, Bolesław I received from his father the stronghold of <a href="/wiki/Dobrzy%C5%84_nad_Wis%C5%82%C4%85" title="Dobrzyń nad Wisłą">Dobrzyń nad Wisłą</a> until 1229, when Konrad I finally forced Grzymisława to surrender to Bolesław I a part of the Duchy of Sandomierz, the district of <a href="/wiki/Radom" title="Radom">Radom</a>. Immediately, Bolesław gave Dobrzyń nad Wisłą to his youngest brother, <a href="/wiki/Siemowit_I_of_Masovia" title="Siemowit I of Masovia">Siemowit I</a>. </p><p>In 1231, Bolesław I became involved with his father and brothers in the installation of the <a href="/wiki/Teutonic_Knights" class="mw-redirect" title="Teutonic Knights">Teutonic Knights</a> in the region of <a href="/wiki/Che%C5%82mno_Land" title="Chełmno Land">Chełmno Land</a>. At the same time, he supported his father in the war to conquer <a href="/wiki/Krak%C3%B3w" title="Kraków">Kraków</a>, after the death of <a href="/wiki/W%C5%82adys%C5%82aw_III_Spindleshanks" title="Władysław III Spindleshanks">Władysław III Spindleshanks</a> in 1231. However, the quick intervention of <a href="/wiki/Henry_I_the_Bearded" class="mw-redirect" title="Henry I the Bearded">Henry I the Bearded</a> (High Duke of Poland from 1232 to 1238) and the invasion of Masovia by Prussians forced to Konrad I to abandon his plans; in addition, Henry I was able to take control of the entire Duchy of <a href="/wiki/Sandomierz" title="Sandomierz">Sandomierz</a>. </p><p>To compensate for the loss of the Duchy of Sandomierz, Konrad I offered his son parts of Masovia, with the district of <a href="/wiki/Sieradz" title="Sieradz">Sieradz</a> as the capital. Nevertheless, Konrad I retained control of foreign policy and of the army. </p><p>In 1234, Boleslaw received the north of Masovia of the <a href="/wiki/Vistula" title="Vistula">Vistula</a> and <a href="/wiki/Bug_River" class="mw-redirect" title="Bug River">Bug Rivers</a> in exchange for the region of <a href="/wiki/Sieradz" title="Sieradz">Sieradz</a> (who was strategically most closer to <a href="/wiki/Lesser_Poland" title="Lesser Poland">Lesser Poland</a> and thus being more important for his father in his fights for the throne of Kraków), while his other brother <a href="/wiki/Casimir_I_of_Kuyavia" title="Casimir I of Kuyavia">Casimir I</a> received <a href="/wiki/Kujawy" class="mw-redirect" title="Kujawy">Kujawy</a>. This distribution of lands must be only temporary, because it was implicit that after the death of their father, the three surviving brothers (Bolesław I, Casimir I and Siemowit I) had to make a new equitable re-distribution of the lands. </p><p>In subsequent years, Bolesław I attacked his Prussian and Russian neighbors. He supported the <a href="/wiki/Order_of_Dobrzy%C5%84" title="Order of Dobrzyń">Order of Dobrzyń</a> and in 1238 he took part in the war against <a href="/wiki/Daniel_of_Galicia" title="Daniel of Galicia">Daniel of Halych</a> and <a href="/wiki/Mindaugas_of_Lithuania" class="mw-redirect" title="Mindaugas of Lithuania">Mindaugas of Lithuania</a>. </p><p>In 1241, after the death of his father-in-law <a href="/wiki/Henry_II_the_Pious" title="Henry II the Pious">Henry II the Pious</a> at the <a href="/wiki/Battle_of_Legnica" title="Battle of Legnica">Battle of Legnica</a>, Bolesław I supported his father's military seizure of <a href="/wiki/Krak%C3%B3w" title="Kraków">Kraków</a>, who this time was able to conquer the Seniorate. His rule lasted only two years, until the Battle of Suchodoły on 25 May 1243, when Konrad I was defeated and forced to retire to Sieradz. </p><p>With the death of Konrad I on 31 August 1247, new horizons opened for Bolesław I. In his father's will, he received most of Masovia; shortly after, he had to face an attack of his brother Casimir I, because he was dissatisfied with his portion of their paternal inheritance. However, before the open war began, Bolesław I died unexpectedly during the spring of 1248 (probably around 25 February). </p><p>By 1232 Bolesław I married firstly with Gertrude (1218/20 – 23/30 April 1244/47), daughter of <a href="/wiki/Henry_II_the_Pious" title="Henry II the Pious">Henry II the Pious</a>. They had no children. </p><p>Between 1245 and July 1247, Bolesław I married secondly with his first cousin once removed<sup id="cite_ref-1" class="reference"><a href="#cite_note-1"><span class="cite-bracket">[</span>1<span class="cite-bracket">]</span></a></sup> Anastasia, daughter of Alexander Vsevolodich, Prince of <a href="/wiki/Belz" title="Belz">Bielsk</a> (in turn a son of <a href="/wiki/Vsevolod_Mstislavich_of_Volhynia" title="Vsevolod Mstislavich of Volhynia">Vsevolod Mstislavich</a>, Prince of Volhynia and Bielsk). They had no children. After her husband's death, she remarried with a Hungarian magnate called Demetri, probably member of the <a href="/wiki/Aba_(genus)" title="Aba (genus)">Aba family</a>. </p><p>With no offspring from any of his marriages, in his will Bolesław I bequeathed all his possessions to his younger brother Siemowit I. This however annoyed Casimir I, and soon the war continued between the surviving brothers.<sup id="cite_ref-2" class="reference"><a href="#cite_note-2"><span class="cite-bracket">[</span>2<span class="cite-bracket">]</span></a></sup> </p> <div class="mw-heading mw-heading2"><h2 id="Notes">Notes</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Boles%C5%82aw_I_of_Masovia&action=edit&section=2" title="Edit section: Notes"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <style data-mw-deduplicate="TemplateStyles:r1239543626">.mw-parser-output .reflist{margin-bottom:0.5em;list-style-type:decimal}@media screen{.mw-parser-output .reflist{font-size:90%}}.mw-parser-output .reflist .references{font-size:100%;margin-bottom:0;list-style-type:inherit}.mw-parser-output .reflist-columns-2{column-width:30em}.mw-parser-output .reflist-columns-3{column-width:25em}.mw-parser-output .reflist-columns{margin-top:0.3em}.mw-parser-output .reflist-columns ol{margin-top:0}.mw-parser-output .reflist-columns li{page-break-inside:avoid;break-inside:avoid-column}.mw-parser-output .reflist-upper-alpha{list-style-type:upper-alpha}.mw-parser-output .reflist-upper-roman{list-style-type:upper-roman}.mw-parser-output .reflist-lower-alpha{list-style-type:lower-alpha}.mw-parser-output .reflist-lower-greek{list-style-type:lower-greek}.mw-parser-output .reflist-lower-roman{list-style-type:lower-roman}</style><div class="reflist"> <div class="mw-references-wrap"><ol class="references"> <li id="cite_note-1"><span class="mw-cite-backlink"><b><a href="#cite_ref-1">^</a></b></span> <span class="reference-text">Anastasia's paternal great-grandmother was <a href="/wiki/Agnes_of_Poland" title="Agnes of Poland">Agnes of Poland</a>, sister of <a href="/wiki/Casimir_II_the_Just" title="Casimir II the Just">Casimir II the Just</a>, Bolesław I's grandfather.</span> </li> <li id="cite_note-2"><span class="mw-cite-backlink"><b><a href="#cite_ref-2">^</a></b></span> <span class="reference-text"><a rel="nofollow" class="external text" href="https://dziedzictwo.polska.pl/katalog/index,Boleslaw_I_Mazowiecki_(Sandomierski),cid,5926.htm">Documentary archive about the reign of Bolesław I of Masovia</a> <a rel="nofollow" class="external text" href="https://web.archive.org/web/20110823043425/http://dziedzictwo.polska.pl/katalog/index%2CBoleslaw_I_Mazowiecki_%28Sandomierski%29%2Ccid%2C5926.htm">Archived</a> August 23, 2011, at the <a href="/wiki/Wayback_Machine" title="Wayback Machine">Wayback Machine</a>.</span> </li> </ol></div></div> <div class="mw-heading mw-heading2"><h2 id="References">References</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Boles%C5%82aw_I_of_Masovia&action=edit&section=3" title="Edit section: References"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <ul><li><a rel="nofollow" class="external text" href="http://www.poczet.com/mazowiecki.htm"><i>Bolesław I Mazowiecki (sandomierski)</i> in: poczet.com</a> [retrieved 15 February 2015].</li></ul> <table class="wikitable succession-box noprint" style="margin:0.5em auto; font-size:small;clear:both;"> <tbody><tr> <td colspan="3" style="border-top: 5px solid #FFD700; text-align:center;"><div>Bolesław I of Masovia </div><div><b><a href="/wiki/Piast_dynasty" title="Piast dynasty">Piast dynasty</a></b></div><span style="white-space:nowrap; font-size:90%; margin:2em"><b>Born:</b> c. 1208</span><span style="white-space:nowrap; font-size:90%; margin:2em"> <b>Died:</b> 25 February 1248</span> </td></tr> <tr style="text-align:center;"> <td style="width:30%;" rowspan="1">Preceded by<div style="font-weight: bold"><a href="/wiki/Boles%C5%82aw_V_the_Chaste" title="Bolesław V the Chaste">Bolesław the Chaste</a></div> </td> <td style="width: 40%; text-align: center;" rowspan="1"><b> <a href="/wiki/Duchy_of_Sandomierz" title="Duchy of Sandomierz">Duke of Sandomierz</a> </b><br />1229–1232 </td> <td style="width: 30%; text-align: center;" rowspan="1">Succeeded by<div style="font-weight: bold">Bolesław the Chaste</div> </td></tr> <tr style="text-align:center;"> <td style="width:30%;" rowspan="1">Preceded by<div style="font-weight: bold"><a href="/wiki/Konrad_I_of_Masovia" title="Konrad I of Masovia">Konrad I</a></div> </td> <td style="width: 40%; text-align: center;" rowspan="1"><b> <a href="/wiki/Duke_of_Masovia" title="Duke of Masovia">Duke of Masovia</a> </b><br />1247–1248 </td> <td style="width: 30%; text-align: center;" rowspan="1">Succeeded by<div style="font-weight: bold"><a href="/wiki/Siemowit_I_of_Masovia" title="Siemowit I of Masovia">Siemowit I</a></div> </td></tr> </tbody></table> <div class="navbox-styles"><style data-mw-deduplicate="TemplateStyles:r1129693374">.mw-parser-output .hlist dl,.mw-parser-output .hlist ol,.mw-parser-output .hlist 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