regicide and massacre
... that Grand Duke Leszek the White and a number of other Polish Piast dukes were ambushed in their baths during the 13th-century regicide and massacre at Gąsawa ?
... that Grand Duke <a href="./Leszek_the_White" id="mwD2s" rel="mw:WikiLink" title="Leszek the White">Leszek the White</a> and a number of other Polish <a class="mw-redirect" href="./Piast" id="mwD2w" rel="mw:WikiLink" title="Piast">Piast</a> dukes were ambushed in their baths during the 13th-century <b id="mwD20"><a href="./Gąsawa_massacre" id="mwD24" rel="mw:WikiLink" title="Gąsawa massacre">regicide and massacre</a></b> at <a href="./Gąsawa" id="mwD28" rel="mw:WikiLink" title="Gąsawa">Gąsawa</a> <i id="mwD3A">(pictured)</i>?