Ferdinand the Holy Prince
... that Prince Henry the Navigator handed over his brother Ferdinand the Holy Prince as a hostage, and preferred to let him die in captivity rather than fulfill the treaty he had signed?
... that Prince <a class="mw-redirect" href="./Henry_the_Navigator" id="mwBGE" rel="mw:WikiLink" title="Henry the Navigator">Henry the Navigator</a> handed over his brother <b id="mwBGI"><a href="./Ferdinand_the_Holy_Prince" id="mwBGM" rel="mw:WikiLink" title="Ferdinand the Holy Prince">Ferdinand the Holy Prince</a></b> <i id="mwBGQ">(pictured)</i> as a hostage, and preferred to let him die in captivity rather than fulfill the treaty he had signed?