Piotrków Trybunalski Castle
... that the 1493 Sejm held at the Piotrków Trybunalski Castle was the first two-chamber parliament in Poland?
... that the 1493 <a class="mw-redirect" href="./General_sejm" id="mw8w" rel="mw:WikiLink" title="General sejm">Sejm</a> held at the <b id="mw9A"><a href="./Piotrków_Trybunalski_Castle" id="mw9Q" rel="mw:WikiLink" title="Piotrków Trybunalski Castle">Piotrków Trybunalski Castle</a></b> was the first two-chamber <a href="./Parliament" id="mw9g" rel="mw:WikiLink" title="Parliament">parliament</a> in <a href="./Poland" id="mw9w" rel="mw:WikiLink" title="Poland">Poland</a>?